A115634 - OEIS

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A115634

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

1, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Row sums of number triangle A115633.`
	FORMULA	`a(n)=40^n-3(1+(-1)^n)/2; a(n)=sum{k=0..n, A115633(n, k)}.`
	CROSSREFS	`Sequence in context: A055240 A174559 A183035 * A010674 A021037 A053387` `Adjacent sequences: A115631 A115632 A115633 * A115635 A115636 A115637`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 27 2006`

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Last modified February 13 10:39 EST 2012. Contains 205459 sequences.