A110182 - OEIS

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A110182

Diagonal sums of number triangle A110180.

1, 1, 2, 2, 5, 9, 26, 66, 199, 575, 1790, 5542, 17945, 58733, 198880, 685296, 2429281, 8778321, 32491940, 122503412, 471379771, 1844669495, 7346727298, 29712688698, 122054603983, 508548201863, 2149211636944, 9204566602696, 39944636660655 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{j=0..floor((n-2k)/2), C(n-2k, j)C(n-2k-j, j)k^j}}`
	CROSSREFS	`Sequence in context: A060405 A003228 A184713 * A193899 A075125 A081374` `Adjacent sequences: A110179 A110180 A110181 * A110183 A110184 A110185`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 14 2005`

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.