A128554 Column 4 of triangle A128545; a(n) is the coefficient of q^(4n+16) in the central q-binomial coefficient [2n+8,n+4].

1, 7, 39, 155, 526, 1555, 4192, 10465, 24620, 55038, 117966, 243723, 487842, 949446, 1802547, 3346632, 6089910, 10881277, 19121293, 33091141, 56466398, 95105255, 158256685, 260386761, 423932473, 683409993, 1091521679, 1728156294

Offset

0,2

Links

Table of n, a(n) for n=0..27.

Prog

(PARI) a(n)=polcoeff(prod(j=n+5, 2*n+8, 1-q^j)/prod(j=1, n+4, 1-q^j), 4*n+16, q)

Crossrefs

Cf. A128545; A128552, A128553.

Sequence in context: A027482 A352310 A196782 * A225617 A032207 A004057

Adjacent sequences: A128551 A128552 A128553 * A128555 A128556 A128557

Keyword

nonn

Author

Paul D. Hanna, Mar 10 2007

Status

approved