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Search: id:A128563
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| 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
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OFFSET
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0,2
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FORMULA
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a(n) is the coefficient of q^(2n+6) in the q-binomial coefficient [2n+5,n+2].
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PROGRAM
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(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)
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CROSSREFS
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Sequence in context: A009845 A014342 A086274 this_sequence A062421 A036889 A036895
Adjacent sequences: A128560 A128561 A128562 this_sequence A128564 A128565 A128566
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 10 2007
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