A113140 Diagonal sums of a Delannoy related triangle.

1, 3, 14, 68, 347, 1819, 9712, 52532, 286905, 1578679, 8738278, 48601968, 271406347, 1520725095, 8545396208, 48138689272, 271768537793, 1537212749339, 8709732836238, 49423440297324, 280835252080651, 1597731101233763

Offset

0,2

Comments

Diagonal sums of A113139.

Links

Table of n, a(n) for n=0..21.

Formula

a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, C(n-2k, j)C(n-k+j, k+j)}}.

Crossrefs

Sequence in context: A354503 A181662 A241478 * A151324 A121185 A276904

Adjacent sequences: A113137 A113138 A113139 * A113141 A113142 A113143

Keyword

easy,nonn

Author

Paul Barry, Oct 15 2005

Status

approved