A127783 - OEIS

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A127783

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

1, 1, 2, 7, 28, 133, 700, 4039, 25160, 167637, 1186482, 8872752, 69810994, 575912978, 4967058182, 44675926159, 418157494016, 4065044047125, 40973402647058, 427535487044903, 4611642948647118, 51354908876927025 (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+xsubst(A^2, x, x+x^2)); polcoeff(A, n)}`
	CROSSREFS	`Cf. A127782, A127784.` `Sequence in context: A118926 A127084 A052319 * A116539 A141318 A030875` `Adjacent sequences: A127780 A127781 A127782 * A127784 A127785 A127786`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 28 2007`

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Last modified February 17 23:46 EST 2012. Contains 206085 sequences.