id:A004989 - OEIS Search Results

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(3^n/n!)*product_{ k=0..n-1 } (3*k - 2).

+0
2

1, -6, -9, -36, -189, -1134, -7371, -50544, -360126, -2640924, -19806930, -151252920, -1172210130, -9197341020, -72921775230, -583374201840, -4703454502335, -38180983607190, -311811366125385, -2560135427134740 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) ~ -2/3Gamma(1/3)^-1n^(-5/3)3^(2n){1 + 5/9n^-1 + ...}` `G.f.: A(x) = (1-9x)^(2/3).`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, prod(k=0, n-1, 3k-2)3^n/n!)`
	CROSSREFS	`Cf. A004988.` `Adjacent sequences: A004986 A004987 A004988 this_sequence A004990 A004991 A004992` `Sequence in context: A100096 A057397 A038263 this_sequence A126110 A098662 A056425`
	KEYWORD	`sign`
	AUTHOR	`Joe Keane (jgk(AT)jgk.org)`

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

AT&T Labs Research