A135870 - OEIS

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A135870

G.f. A(x) = (1 + x*A(3x))^2.

1, 2, 13, 246, 13554, 2210436, 1076561037, 1570714992558, 6871883750090694, 90179738434097457084, 3550105797469080332658354, 419263945026939228053105930844, 148543119421079567735277052592081220 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Self-convolution of A135869.`
	PROG	`(PARI) {a(n)=local(A=1+x+xO(x^n)); for(i=0, n, A=1+xsubst(A, x, 3*x)^2); polcoeff(A^2, n)}`
	CROSSREFS	`Cf. A135868, A135869.` `Sequence in context: A015196 A187648 A113098 * A133067 A042677 A134296` `Adjacent sequences: A135867 A135868 A135869 * A135871 A135872 A135873`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2007`

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Last modified February 14 21:50 EST 2012. Contains 205663 sequences.