id:A108953 - OEIS Search Results

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Convolution of 3^n*n! and n!.

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1, 4, 23, 192, 2184, 31728, 560412, 11630592, 276921216, 7433925120, 222038547840, 7301712936960, 262112637864960, 10198096116526080, 427456901317420800, 19202256562264473600, 920321900537337446400 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`E.g.f.: ln(1-4x+3x^2)/((3x-4)); a(n)=n!sum{k=0..n, 3^k/binomial(n, k)}; a(n)=sum{k=0..n, k!3^k*(n-k)!};`
	CROSSREFS	`Sequence in context: A106174 A056814 A058863 this_sequence A099869 A056785 A105747` `Adjacent sequences: A108950 A108951 A108952 this_sequence A108954 A108955 A108956`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 21 2005`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research