id:A093638 - OEIS Search Results

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G.f.: A(x) = Product_{n>=0} 1/(1-a(n)*x^(n+1))^2 = Sum_{n>=0} a(n)*x^n.

+0
3

1, 2, 7, 26, 109, 466, 2142, 9870, 47438, 228750, 1133373, 5618252, 28431660, 143809690, 738803296, 3794224624, 19718366257, 102416655624, 537315418006, 2816334685644, 14883569577907, 78603101910486, 417974689553235 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Equals the self-convolution of A093639.`
	EXAMPLE	`1/((1-x)(1-2x^2)(1-7x^3)(1-26x^4))^2 = 1+ 2x+ 7x^2+ 26x^3+...`
	PROGRAM	`(PARI) a(n) =polcoeff(prod(i=0, n-1, 1/(1-a(i)x^(i+1))^2)+xO(x^n), n)`
	CROSSREFS	`Cf. A093637, A093639.` `Sequence in context: A150577 A150578 A150579 this_sequence A150580 A150581 A150582` `Adjacent sequences: A093635 A093636 A093637 this_sequence A093639 A093640 A093641`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 07 2004`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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