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A027240 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026769. 0
1, 4, 19, 80, 391, 1738, 8797, 40878, 212491, 1023392, 5426518, 26891674, 144717381, 733600690, 3991767587, 20603079346, 113049604075, 591971513924, 3269119157724, 17319091807608, 96127613360983, 514139933872914, 2865265217457906, 15446276427044382, 86367699910234830 (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: A122909 A215037 A181300 * A326649 A050914 A017961

Adjacent sequences:  A027237 A027238 A027239 * A027241 A027242 A027243

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified May 25 00:03 EDT 2022. Contains 354047 sequences. (Running on oeis4.)