A026947 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026374.

1, 6, 24, 144, 541, 3258, 12275, 74280, 282003, 1713690, 6549906, 39938616, 153481299, 938430990, 3622111560, 22195961280, 85975792075, 527816696850, 2050493623760, 12607504827600, 49098707209695, 302275142049870, 1179633190545755, 7270432009471224, 28423658754983701

Offset

1,2

Links

Table of n, a(n) for n=1..25.

Crossrefs

Sequence in context: A047712 A188330 A126267 * A366757 A250743 A265883

Adjacent sequences: A026944 A026945 A026946 * A026948 A026949 A026950

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 17 2019

Status

approved