A117448 - OEIS

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A117448

Diagonal sums of number triangle A117446.

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

	OFFSET	`0,7`
	FORMULA	`a(n)=sum{k=0..floor(n/2), C(L(k/3),n-2k)}, where L(j/p) is the Legendre symbol of j and p.`
	CROSSREFS	`Sequence in context: A029338 A048272 A112329 * A093321 A046144 A144736` `Adjacent sequences: A117445 A117446 A117447 * A117449 A117450 A117451`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 16 2006`

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.