A128563 - OEIS

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A128563

Column 2 of triangle A128562.

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; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n) is the coefficient of q^(2n+6) in the q-binomial coefficient [2n+5,n+2].`
	PROG	`(PARI) a(n)=polcoeff(prod(j=n+3, 2n+5, 1-q^j)/prod(j=1, n+3, 1-q^j), 2n+6, q)`
	CROSSREFS	`Sequence in context: A014342 A086274 A174121 * A192978 A062421 A036889` `Adjacent sequences: A128560 A128561 A128562 * A128564 A128565 A128566`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 10 2007`

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Last modified February 14 15:39 EST 2012. Contains 205635 sequences.