A127784 - OEIS

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A127784

G.f. satisfies: A(x) = 1 + (x+x^2)*A(x+x^2)^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; refs; listen; history; internal format)

	OFFSET	`0,3`
	PROG	`(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: A145144 A199212 A113283 * A112696 A192925 A132006` `Adjacent sequences: A127781 A127782 A127783 * A127785 A127786 A127787`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 28 2007`

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Last modified February 17 20:50 EST 2012. Contains 206085 sequences.