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Search: id:A036999
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| A036999 |
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Restricted permutations.
(Formerly N1692)
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+0
2
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| 6, 9, 12, 18, 27, 42, 66, 105, 168, 270, 435, 702, 1134, 1833, 2964, 4794, 7755, 12546, 20298, 32841, 53136, 85974, 139107, 225078, 364182, 589257, 953436, 1542690, 2496123, 4038810, 6534930, 10573737, 17108664, 27682398, 44791059
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. S. Mendelsohn, Permutations with restricted displacement, Canad. Math. Bull., 4 (1961), 29-38.
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FORMULA
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3*A000381.
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CROSSREFS
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Equals A022086(n+3) + 3.
Sequence in context: A117714 A114554 A023386 this_sequence A118782 A106218 A118521
Adjacent sequences: A036996 A036997 A036998 this_sequence A037000 A037001 A037002
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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