A112518 - OEIS

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A112518

Expansion of 1/(1-x+2x^3+x^4).

1, 1, 1, -1, -4, -7, -6, 3, 21, 40, 40, -5, -106, -226, -256, -39, 519, 1257, 1591, 592, -2441, -6880, -9655, -5365, 10836, 37026, 57411, 41104, -43784, -195632, -335251, -288787, 146261, 1012395, 1925220, 1921485, -249566, -5112401, -10880591, -12302944 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	COMMENTS	`Row sums of A112517.`
	FORMULA	`a(n)=a(n-1)-2a(n-3)-a(n-4); a(n)=sum{k=0..n, sum{j=0..n, C(j, n-j)C(k, j-k)(-1)^(j-k)}}.`
	CROSSREFS	`Sequence in context: A078974 A094641 A200021 * A056849 A116081 A105228` `Adjacent sequences: A112515 A112516 A112517 * A112519 A112520 A112521`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 09 2005`

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Last modified February 15 14:33 EST 2012. Contains 205818 sequences.