id:A129683 - OEIS Search Results

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Expansion of (1/(1-2x))*exp(2x/(1-x)).

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1, 4, 28, 272, 3344, 49472, 852928, 16758016, 369082624, 8996922368, 240294124544, 6974172532736, 218457925292032, 7342688736329728, 263513011737051136, 10054112734940561408, 406301504472849907712 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n)=2^n*A002720(n).`
	FORMULA	`E.g.f.: (1/(1-2x))exp(2x/(1-x)); a(n)=2^nn!*sum{k=0..n, C(n,k)/k!};`
	CROSSREFS	`Adjacent sequences: A129680 A129681 A129682 this_sequence A129684 A129685 A129686` `Sequence in context: A141004 A138272 A112915 this_sequence A081917 A128318 A032274`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 28 2007`

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Last modified October 12 14:39 EDT 2008. Contains 144830 sequences.

AT&T Labs Research