id:A137160 - OEIS Search Results

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G.f.: 1 = Sum_{n>=0} a(n)*x^n*(1-x)/(1+x)^(2^n).

+0
5

1, 2, 4, 12, 64, 664, 13856, 584668, 49751520, 8509625760, 2919099754336, 2005648412219832, 2758163973596156000, 7588978611071894509464, 41769719229784446295570112, 459846172005153447271276789620 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Equals the unsigned row sums of triangle A137156.`
	PROGRAM	`(PARI) {a(n)=polcoeff(1-sum(k=0, n-1, a(k)x^k(1-x)/(1+x+x*O(x^n))^(2^k) ), n)}`
	CROSSREFS	`Cf. A137156; A001192, A137157, A137158, A137159.` `Adjacent sequences: A137157 A137158 A137159 this_sequence A137161 A137162 A137163` `Sequence in context: A013202 A004400 A005831 this_sequence A013207 A078919 A085864`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 24 2008`

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Last modified January 7 17:35 EST 2009. Contains 152824 sequences.

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