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A027316 a(n) = Sum_{k=0..m-1} T(n,k) * T(n,k+1), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082. 0
1, 4, 15, 70, 644, 5502, 46936, 402164, 3460536, 29885592, 258897792, 2248831350, 19579288052, 170814593158, 1492927792104, 13069310259850, 114576104658836, 1005775588360122, 8839355153926048, 77768991557179442, 684886480844420844, 6037008171432448154 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Sequence in context: A000882 A098614 A356407 * A085349 A185133 A278640

Adjacent sequences: A027313 A027314 A027315 * A027317 A027318 A027319

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 27 2019

STATUS

approved

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Last modified December 7 07:00 EST 2022. Contains 358649 sequences. (Running on oeis4.)