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A128553 Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3]. 3
1, 5, 18, 58, 155, 383, 867, 1860, 3782, 7409, 13989, 25683, 45905, 80262, 137453, 231269, 382689, 624061, 1003787, 1594796, 2504587, 3892100, 5988403, 9129707, 13798792, 20688367, 30781988, 45473815, 66723042, 97276842, 140959603 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..30.

PROG

(PARI) a(n)=polcoeff(prod(j=n+4, 2*n+6, 1-q^j)/prod(j=1, n+3, 1-q^j), 3*n+9, q)

CROSSREFS

Cf. A128545; A128552, A128554.

Sequence in context: A271014 A272583 A247717 * A190163 A335551 A235612

Adjacent sequences:  A128550 A128551 A128552 * A128554 A128555 A128556

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 10 2007

STATUS

approved

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Last modified January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)