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A107268 Sums of antidiagonals of A107267. 2
1, 1, 2, 5, 14, 46, 173, 733, 3436, 17572, 96997, 573268, 3604687, 23990345, 168254444, 1238889493, 9546211068, 76761000444, 642524333589, 5586361188966, 50351455288661, 469653513479395, 4526242614854118, 45005754238016688 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..250

FORMULA

a(n) = Sum_{k=0..n} Sum_{j=0..n-k} 1/(j+1) C(j+1,n-k-j+1) C(n-k,j) k^j.

a(n) = Sum_{k=0..n} Sum_{j=0..k} 1/(j+1) C(j+1,k-j+1) C(k,j) (n-k)^j.

CROSSREFS

Sequence in context: A001680 A275424 A328429 * A231211 A006216 A148337

Adjacent sequences:  A107265 A107266 A107267 * A107269 A107270 A107271

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 15 2005

STATUS

approved

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Last modified May 26 10:17 EDT 2022. Contains 354086 sequences. (Running on oeis4.)