A114214 - OEIS

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A114214

Diagonal sums of number triangle A114213.

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; refs; listen; history; internal format)

	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 * A196383 A074198 A196169` `Adjacent sequences: A114211 A114212 A114213 * A114215 A114216 A114217`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 17 2005`

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Last modified February 14 20:13 EST 2012. Contains 205663 sequences.