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A026977 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026659. 0
1, 4, 24, 90, 365, 1376, 7365, 28002, 121049, 465004, 2437089, 9396986, 41758527, 162167568, 842470494, 3277804402, 14798196587, 57865149612, 299015494394, 1170434872374, 5339682500573, 20979019813768, 107997589923134, 424558473013940, 1951503161793927, 7693926097133316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A212681 A026694 A026967 * A026952 A222670 A225681

Adjacent sequences:  A026974 A026975 A026976 * A026978 A026979 A026980

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More term from Sean A. Irvine, Oct 20 2019

STATUS

approved

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Last modified August 5 21:18 EDT 2020. Contains 336213 sequences. (Running on oeis4.)