id:A110182 - OEIS Search Results

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Diagonal sums of number triangle A110180.

+0
2

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; listen)

	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: A002990 A060405 A003228 this_sequence A075125 A081374 A117400` `Adjacent sequences: A110179 A110180 A110181 this_sequence A110183 A110184 A110185`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 14 2005`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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