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A110182 Diagonal sums of number triangle A110180. 1
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; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..28.

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: A326493 A003228 A184713 * A309867 A304584 A193899

Adjacent sequences:  A110179 A110180 A110181 * A110183 A110184 A110185

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jul 14 2005

STATUS

approved

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Last modified December 10 00:54 EST 2019. Contains 329885 sequences. (Running on oeis4.)