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A026952 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026386. 0
1, 4, 24, 90, 541, 2032, 12275, 46472, 282003, 1075404, 6549906, 25125114, 153481299, 591529776, 3622111560, 14013307170, 85975792075, 333669151420, 2050493623760, 7978700883230, 49098707209695, 191470222802880, 1179633190545755, 4608890486329844, 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: A026694 A026967 A026977 * A222670 A225681 A259814

Adjacent sequences:  A026949 A026950 A026951 * A026953 A026954 A026955

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 17 2019

STATUS

approved

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Last modified August 11 18:37 EDT 2020. Contains 336428 sequences. (Running on oeis4.)