id:A034689 - OEIS Search Results

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One half of sextic factorial numbers.

+0
13

1, 8, 112, 2240, 58240, 1863680, 70819840, 3116072960, 155803648000, 8725004288000, 540950265856000, 36784618078208000, 2722061737787392000, 217764939022991360000, 18727784755977256960000 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`2a(n) = (6n-4)(!^6) := product(6j-4, j=1..n) = 2^nA007559(n), A007559(n)=(3n-2)(!^3) := product(3j-2, j=1..n); E.g.f. (-1+(1-6*x)^(-1/3))/2.)`
	CROSSREFS	`Cf. A008542, A007559.` `Adjacent sequences: A034686 A034687 A034688 this_sequence A034690 A034691 A034692` `Sequence in context: A139741 A067900 A067414 this_sequence A010041 A099703 A064090`
	KEYWORD	`easy,nonn`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)`

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Last modified October 15 20:12 EDT 2008. Contains 145099 sequences.

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