id:A155041 - OEIS Search Results

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Diagonal sums of symmetric (1,-1)-triangle A155040.

+0
2

1, 1, 2, 0, 1, -1, 2, 0, 3, -1, 2, -2, 3, -1, 4, -2, 3, -3, 4, -2, 5, -3, 4, -4, 5, -3, 6, -4, 5, -5, 6, -4, 7, -5, 6, -6, 7, -5, 8, -6, 7, -7, 8, -6, 9, -7, 8, -8, 9, -7, 10, -8, 9, -9, 10, -8, 11, -9, 10, -10, 11, -9, 12, -10, 11, -11, 12, -10, 13, -11, 12, -12, 13, -11, 14, -12, 13 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`First differences of A155041 are (-1)^n*A008611.`
	FORMULA	`G.f.: (1+x+x^2)/(1-x^2+x^3-x^5);` `a(2n)=A008611(n+2)=[x^n](1+x-x^2)/(1-x-x^3+x^4); a(2n+1)=[x^n](1-x-x^2)/(1-x-x^3+x^4).`
	CROSSREFS	`Sequence in context: A029360 A088432 A071466 this_sequence A108455 A117468 A116374` `Adjacent sequences: A155038 A155039 A155040 this_sequence A155042 A155043 A155044`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 19 2009`

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

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