id:A114214 - OEIS Search Results

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Diagonal sums of number triangle A114213.

+0
2

1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 4, 4, 5, 5, 7, 7, 8, 8, 7, 7, 7, 7, 8, 8, 7, 7, 5, 5, 6, 6, 9, 9, 11, 11, 10, 10, 11, 11, 13, 13, 12, 12, 9, 9, 9, 9, 12, 12, 13, 13, 11, 11, 10, 10, 11, 11, 9, 9, 6, 6, 7, 7, 11, 11, 14, 14, 13, 13, 15, 15, 18, 18, 17, 17, 13, 13, 14, 14, 19, 19, 21 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), mod(sum{j=0..n-2k, C(k, j)C(n-2k, j)(1+(-1)^k)/2}, 2)}.`
	CROSSREFS	`Sequence in context: A156251 A116458 A093875 this_sequence A074198 A048688 A092695` `Adjacent sequences: A114211 A114212 A114213 this_sequence A114215 A114216 A114217`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 17 2005`

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

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