id:A115264 - OEIS Search Results

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Diagonal sums of correlation triangle for floor((n+2)/2).

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1, 1, 3, 4, 8, 10, 17, 21, 32, 39, 55, 66, 89, 105, 136, 159, 200, 231, 284, 325, 392, 445, 528, 595, 697, 780, 903, 1005, 1152, 1275, 1449, 1596, 1800, 1974, 2211, 2415, 2689, 2926, 3240, 3514, 3872, 4186, 4592, 4950, 5408, 5814, 6328, 6786, 7361 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of A115263.`
	FORMULA	`G.f.: (1+x)(1+x^2)/((1-x^2)^2(1-x^3)(1-x^4)^2); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, [j<=k]floor((k-j+2)/2)[j<=n-2k]*floor((n-2k-j+2)/2)}}.`
	CROSSREFS	`Sequence in context: A092534 A005232 A165272 this_sequence A147617 A072606 A098764` `Adjacent sequences: A115261 A115262 A115263 this_sequence A115265 A115266 A115267`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 18 2006`

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

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