id:A117448 - OEIS Search Results

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Diagonal sums of number triangle A117446.

+0
2

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; listen)

	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 this_sequence A093321 A046144 A144736` `Adjacent sequences: A117445 A117446 A117447 this_sequence A117449 A117450 A117451`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 16 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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