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A107704 Diagonal sums of A103209, viewed as number triangle. 0
1, 1, 2, 3, 8, 26, 107, 492, 2481, 13599, 81288, 531343, 3790344, 29279668, 242278645, 2125160800, 19608039385, 189437263949, 1912477987102, 20161911603747, 221869317899264, 2546362514225134, 30430660439311103 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(n-2k+j, 2j)*k^j*C(k)}}, C(n) given by A000108.

CROSSREFS

Sequence in context: A243963 A065619 A111121 * A246446 A041399 A183948

Adjacent sequences:  A107701 A107702 A107703 * A107705 A107706 A107707

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 21 2005

STATUS

approved

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Last modified December 10 13:37 EST 2016. Contains 279004 sequences.