id:A093635 - OEIS Search Results

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

+0
3

1, 2, 5, 18, 64, 258, 1061, 4572, 19809, 88972, 400600, 1844602, 8511540, 39919338, 187389085, 891158688, 4238242129, 20365627200, 97881057229, 474301930632, 2297986873946, 11213069093460, 54697034675149, 268399278895406 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Equals the self-convolution of A093636.`
	EXAMPLE	`( (1+x)(1+2x^2)(1+5x^3)(1+18x^4) )^2 = 1+2x+5x^2+18x^3+...`
	PROGRAM	`(PARI) a(n) =polcoeff(prod(i=0, n-1, (1+a(i)x^(i+1))^2)+xO(x^n), n)`
	CROSSREFS	`Cf. A032305, A093636.` `Sequence in context: A048221 A056296 A068000 this_sequence A024025 A084518 A005753` `Adjacent sequences: A093632 A093633 A093634 this_sequence A093636 A093637 A093638`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 07 2004`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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