id:A014479 - OEIS Search Results

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Exponential generating function = (1+2x)/(1-2x)^3.

+0
2

1, 8, 72, 768, 9600, 138240, 2257920, 41287680, 836075520, 18579456000, 449622835200, 11771943321600, 331576403558400, 9998303861145600, 321374052679680000, 10969567664799744000, 396275631890890752000 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = A014477(n) * n!. - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Nov 02 2006`
	MAPLE	`seq(add(count(Composition(k))*count(Permutation(k)), k=1..n), n=1..17); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 17 2006`
	CROSSREFS	`Adjacent sequences: A014476 A014477 A014478 this_sequence A014480 A014481 A014482` `Sequence in context: A098411 A082366 A049388 this_sequence A013992 A129103 A111812`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research