id:A073782 - OEIS Search Results

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a(n)=Sum[S(k)S(n-k), (k=0,..,n)], convolution of S(n) A001644 with itself.

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9, 6, 19, 48, 89, 190, 391, 784, 1577, 3142, 6219, 12256, 24041, 46974, 91471, 177568, 343753, 663814, 1278979, 2459152, 4719417, 9041470, 17294039, 33030320, 62999145, 120006214, 228327099, 433939904, 823854793, 1562602238 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`G.f.: (3-2x-x^2)^2/(1-x-x^2-x^3)^2`
	MATHEMATICA	`CoefficientList[Series[(3-2x-x^2)^2/(1-x-x^2-x^3)^2, {x, 0, 40}], x]`
	CROSSREFS	`Cf. A001644.` `Sequence in context: A102648 A040074 A088999 this_sequence A156033 A038296 A058276` `Adjacent sequences: A073779 A073780 A073781 this_sequence A073783 A073784 A073785`
	KEYWORD	`easy,nonn`
	AUTHOR	`Mario Catalani (mario.catalani(AT)unito.it), Aug 11 2002`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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