id:A134356 - OEIS Search Results

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a(n) = Product_{k=1..n-1} (3k+1)!/(n+k)!.

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1, 4, 42, 1008, 51480, 5353920, 1100473920, 437480709120, 330886851724800, 470053968773760000, 1241242628123282400000, 6040838558884497984000000, 53797620867616662708672000000, 871394214986903051252166758400000 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`a = {}; Do[k = Product[(3i + 1)!/(n + i)!, {i, 1, n - 1}]; AppendTo[a, k], {n, 1, 20}]; a`
	CROSSREFS	`Cf. A005130.` `Sequence in context: A074768 A140055 A143990 this_sequence A156479 A111829 A130545` `Adjacent sequences: A134353 A134354 A134355 this_sequence A134357 A134358 A134359`
	KEYWORD	`nonn`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Oct 22 2007`

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Last modified December 17 19:35 EST 2009. Contains 170826 sequences.

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