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A027268 a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1)}, with T given by A026536. 0
0, 6, 20, 180, 644, 5502, 20292, 174456, 654632, 5673140, 21528000, 187675644, 717800628, 6284986554, 24178479500, 212408191568, 820811282352, 7229648901024, 28037230854096, 247468885359240, 962488105227160, 8510025522045036, 33177800527098040, 293772371437293720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Sequence in context: A332391 A027148 A095854 * A000388 A227769 A309454

Adjacent sequences:  A027265 A027266 A027267 * A027269 A027270 A027271

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)