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A128563 Column 2 of triangle A128562. 1
1, 4, 12, 29, 61, 120, 222, 392, 669, 1109, 1792, 2838, 4413, 6751, 10184, 15169, 22332, 32538, 46955, 67162, 95288, 134173, 187593, 260562, 359682, 493622, 673736, 914814, 1236057, 1662340, 2225738, 2967500, 3940540, 5212495, 6869598 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..34.

FORMULA

a(n) is the coefficient of q^(2*n+6) in the q-binomial coefficient [2*n+5, n+2].

PROG

(PARI) a(n)=polcoeff(prod(j=n+3, 2*n+5, 1-q^j)/prod(j=1, n+3, 1-q^j), 2*n+6, q)

CROSSREFS

Sequence in context: A014342 A086274 A174121 * A227085 A192978 A260546

Adjacent sequences:  A128560 A128561 A128562 * A128564 A128565 A128566

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 10 2007

STATUS

approved

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Last modified July 4 12:18 EDT 2020. Contains 335448 sequences. (Running on oeis4.)