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

1,2

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Sequence in context: A145221 A027148 A095854 * A000388 A227769 A267903

Adjacent sequences:  A027265 A027266 A027267 * A027269 A027270 A027271

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 16 04:34 EST 2019. Contains 320140 sequences. (Running on oeis4.)