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A092469 a(n)=sum(i+j+k=n,(n+2j)!/i!/(3j)!/k!) 0<=i<=j<=k<=n. 0
1, 1, 13, 91, 1081, 10606, 181189, 2025325, 38378449, 548523856, 10811257051, 176339404099, 3828413138785, 68734868302738, 1590128353317001, 31543123841374681, 768191679788034529, 16494997547298477340 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..17.

PROG

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

CROSSREFS

Sequence in context: A221144 A022578 A090020 * A300779 A275918 A027670

Adjacent sequences:  A092466 A092467 A092468 * A092470 A092471 A092472

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 25 2004

STATUS

approved

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Last modified June 22 06:39 EDT 2021. Contains 345373 sequences. (Running on oeis4.)