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A092470 a(n)=sum(i+j+k=n,(n+2i)!/(2*i)!/j!/k!) 0<=i<=j<=k<=n. 0
1, 3, 42, 774, 19440, 605520, 22856400, 1012258800, 51590125440, 2974547691360, 191478611348640, 13613255894921760, 1059445820574741600, 89583977589282015840, 8178390058456647469440, 801733426581997672963200 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

PROG

(PARI) a(n)=sum(i=0, n, sum(j=0, i, sum(k=0, j, if(i+j+k-n, 0, (n+2*i)!/(2*i)!/j!/k!))))

CROSSREFS

Sequence in context: A219619 A097068 A269046 * A206820 A157542 A078601

Adjacent sequences:  A092467 A092468 A092469 * A092471 A092472 A092473

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 25 2004

STATUS

approved

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Last modified September 19 04:52 EDT 2019. Contains 327187 sequences. (Running on oeis4.)