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A026947 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026374. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A047712 A188330 A126267 * A250743 A265883 A165491

Adjacent sequences:  A026944 A026945 A026946 * A026948 A026949 A026950

KEYWORD

nonn,changed

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 17 2019

STATUS

approved

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Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)