id:A135868 - OEIS Search Results

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

+0
9

1, 2, 9, 80, 1368, 45344, 2952208, 381005824, 97928967168, 50238812700672, 51495089926791168, 105513593089512439808, 432289346894817079853056, 3541746937174189008054386688, 58031524865557213409213540204544 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Self-convolution of A135867.`
	PROGRAM	`(PARI) {a(n)=local(A=1+x+xO(x^n)); for(i=0, n, A=1+xsubst(A, x, 2*x)^2); polcoeff(A^2, n)}`
	CROSSREFS	`Cf. A135867.` `Sequence in context: A056918 A122720 A109519 this_sequence A147302 A112670 A117581` `Adjacent sequences: A135865 A135866 A135867 this_sequence A135869 A135870 A135871`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2007`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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