id:A117363 - OEIS Search Results

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

+0
2

1, -2, 1, -3, 3, -4, 6, -7, 10, -13, 17, -23, 30, -40, 53, -70, 93, -123, 163, -216, 286, -379, 502, -665, 881, -1167, 1546, -2048, 2713, -3594, 4761, -6307, 8355, -11068, 14662, -19423, 25730, -34085, 45153, -59815, 79238 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Diagonal sums of number triangle A117362.`
	FORMULA	`a(n)=a(n-2)-a(n-3); a(n)=sum{k=0..floor(n/2), (-1)^n(C(k,n-2k)+2C(k,n-2k-1))}.`
	CROSSREFS	`Cf. A109248, A007307.` `Sequence in context: A130067 A032303 A032215 this_sequence A007307 A141576 A078019` `Adjacent sequences: A117360 A117361 A117362 this_sequence A117364 A117365 A117366`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 10 2006`

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

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