id:A107068 - OEIS Search Results

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Expansion of 1/((1+x)^3-x^4).

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1, -3, 6, -10, 16, -27, 49, -92, 172, -316, 573, -1035, 1874, -3406, 6204, -11303, 20577, -37432, 68072, -123800, 225193, -409683, 745342, -1355970, 2466760, -4487395, 8163217, -14850196, 27015092, -49145300, 89404037, -162641499, 295872778, -538243174, 979156724, -1781254927, 3240410561 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/(1+3x+3x^2+x^3-x^4); a(n)=sum{k=0..n+4, (-1)^(n-k)C(n+4, k)sum{j=0..floor(k/4), C(k-3j, j)}}.`
	CROSSREFS	`Cf. A077990.` `Sequence in context: A114324 A054886 A130578 this_sequence A033541 A038505 A119971` `Adjacent sequences: A107065 A107066 A107067 this_sequence A107069 A107070 A107071`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 10 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research