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A132305
Sum of fifth powers of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^5 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.
2
1, 3, 309, 32847, 4775301, 764206503, 131689759209, 23857704965727, 4487745064421061, 869024373004460823, 172218243516497425809, 34778752398142969125627, 7134304921516864247956281
OFFSET
0,2
PROG
(PARI) a(n)=sum(k=0, 2*n, polcoeff((1+x+x^2)^n, k)^5)
CROSSREFS
Sequence in context: A218361 A085319 A123032 * A074327 A179109 A316329
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 18 2007
STATUS
approved