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Search: id:A000191
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| A000191 |
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Generalized tangent numbers d(3,n).
(Formerly M2166 N0864)
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+0
4
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| 2, 46, 3362, 515086, 135274562, 54276473326, 30884386347362, 23657073914466766, 23471059057478981762, 29279357851856595135406, 44855282210826271011257762, 82787899853638102222862479246
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 689-694; 22 (1968), 699.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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a(n) = 2*A002439(n). - njas, Nov 06 2009
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MATHEMATICA
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L[ a_, s_, t_:10000 ] := Plus@@Table[ N[ JacobiSymbol[ -a, 2k+1 ](2k+1)^(-s), 30 ], {k, 0, t} ]; d[ a_, n_, t_:10000 ] := (2n-1)!/Sqrt[ a ](2a/Pi)^(2n)L[ -a, 2n, t ]
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CROSSREFS
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Cf. A000192, A002439, A002437, A156172.
Sequence in context: A012001 A012006 A074041 this_sequence A000192 A124690 A141579
Adjacent sequences: A000188 A000189 A000190 this_sequence A000192 A000193 A000194
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KEYWORD
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nonn,easy,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms and Mathematica program from Eric Weisstein (eric(AT)weisstein.com), Aug 30, 2001
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