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A026947 a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=n-1, T given by A026374. 0
1, 6, 24, 144, 541, 3258, 12275, 74280, 282003, 1713690, 6549906, 39938616, 153481299, 938430990, 3622111560, 22195961280, 85975792075, 527816696850 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Sequence in context: A047712 A188330 A126267 * A250743 A265883 A165491

Adjacent sequences:  A026944 A026945 A026946 * A026948 A026949 A026950

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 21 21:41 EST 2018. Contains 299427 sequences. (Running on oeis4.)