id:A127784 - OEIS Search Results

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G.f. satisfies: A(x) = 1 + (x+x^2)*A(x+x^2)^2.

+0
2

1, 1, 3, 11, 51, 266, 1540, 9681, 65291, 468401, 3551693, 28327029, 236731183, 2066583601, 18796448581, 177735656083, 1743920667437, 17725856560839, 186366309301259, 2024042644283702, 22679125592930412, 261873356070694571 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) {a(n)=local(A=1+x+xO(x^n)); for(i=0, n, A=1+subst(xA^2, x, x+x^2)); polcoeff(A, n)}`
	CROSSREFS	`Cf. A127782, A127783.` `Sequence in context: A024336 A145144 A113283 this_sequence A112696 A132006 A020043` `Adjacent sequences: A127781 A127782 A127783 this_sequence A127785 A127786 A127787`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 28 2007`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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