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A068409 a(n) = binomial(binomial(2*n,n),n). 1
1, 2, 15, 1140, 916895, 8137369800, 850423134076516, 1105964895591808388136, 18627853605123584223921210120, 4180709311038401636820646431913319660, 12767818425644517198178541333546326811326975100 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MAPLE
f:= n -> binomial(binomial(2*n, n), n):
map(f, [$0..12]); # Robert Israel, Jan 15 2017
PROG
(PARI) a(n)=binomial(binomial(2*n, n), n)
CROSSREFS
Cf. A000984.
Sequence in context: A090604 A007467 A132317 * A359849 A096232 A193869
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 05 2002
EXTENSIONS
Edited by N. J. A. Sloane at the suggestion of Vladeta Jovovic, Apr 14 2008
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)