id:A108360 - OEIS Search Results

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Expansion of (1-2x)^2/((1-x)^2(1-2x-x^2)^2).

+0
2

1, 2, 5, 12, 30, 76, 194, 496, 1267, 3230, 8215, 20844, 52768, 133304, 336100, 845888, 2125381, 5332058, 13357833, 33419820, 83510018, 208437060, 519691110, 1294430448, 3221081335, 8008262966, 19893476315, 49378623564, 122473408452 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of number triangle A108359.`
	FORMULA	`G.f.: (1-4x+4x^2)/(1-6x+11x^2-4x^3-5x^4+2x^5+x^6); a(n)=sum{k=0..n, sum{j=0..n-k, C(k, j)C(n-j, k)*floor((j+2)/2)}}.`
	CROSSREFS	`Sequence in context: A076883 A026580 A092247 this_sequence A051163 A051450 A038508` `Adjacent sequences: A108357 A108358 A108359 this_sequence A108361 A108362 A108363`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 31 2005`

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Last modified September 6 09:40 EDT 2008. Contains 143480 sequences.

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