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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
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: A326493 A003228 A184713 * A309867 A304584 A193899
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jul 14 2005
STATUS
approved