id:A117946 - OEIS Search Results

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a(3n)=0, a(3n+1)/a(1)=a(3n+2)/a(2)=A059151(n).

+0
2

0, 1, -2, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 4, -8, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 4, -8, 0, 2, -4, 0, 4, -8, 0, 8, -16, 0, 4, -8, 0, 2, -4, 0, 4, -8, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 4, -8, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 1, -2, 0, 2, -4, 0, 4, -8, 0, 2, -4, 0, 4, -8, 0, 8, -16, 0, 4, -8 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Second column of A117939.`
	FORMULA	`a(n)=sum{k=0..n, L((n-j)/3)*L(C(n,k)/3)} where L(j/p) is the Legendre symbol of j and p.`
	CROSSREFS	`Sequence in context: A099040 A136717 A136716 this_sequence A061930 A141660 A115273` `Adjacent sequences: A117943 A117944 A117945 this_sequence A117947 A117948 A117949`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 05 2006`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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