|
Search: id:A000033
|
|
|
| A000033 |
|
Coefficients of menage hit polynomials.
(Formerly M0602 N0216)
|
|
+0
5
|
|
| 0, 2, 3, 4, 40, 210, 1477, 11672, 104256, 1036050, 11338855, 135494844, 1755206648, 24498813794, 366526605705, 5851140525680, 99271367764480, 1783734385752162, 33837677493828171, 675799125332580020, 14173726082929399560, 311462297063636041906
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
REFERENCES
|
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 197.
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).
|
|
LINKS
|
David W. Wilson, Table of n, a(n) for n = 1..100
|
|
FORMULA
|
a(n) = coefficient of t^2 in polynomial p(t) = SUM(k = 0..n, (2n C(2n-k,k) (n-k)! (t-1)^k)/(2n-k))
a(n) = SUM(k = 2..n, ((-1)^k n (2n-k-1)! (n-k)!)/((2n-2k)! (k-2)!)) - David W. Wilson (davidwwilson(AT)comcast.net), Jun 22 2006
|
|
CROSSREFS
|
a(n) = n*A000426(n) - Vladeta Jovovic(vladeta(AT)eunet.rs), Dec 27 2007
A diagonal of A058087. Cf. A000179, A000425.
Sequence in context: A037326 A024634 A134305 this_sequence A060411 A037322 A037429
Adjacent sequences: A000030 A000031 A000032 this_sequence A000034 A000035 A000036
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com) and Simon Plouffe (simon.plouffe(AT)gmail.com)
|
|
EXTENSIONS
|
Extended to 34 terms by N. J. A. Sloane (njas(AT)research.att.com), May 25 2005
Edited and further extended by David W. Wilson, Dec 27 2007
|
|
|
Search completed in 0.002 seconds
|
