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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
OFFSET
1,2
CROSSREFS
Sequence in context: A122909 A215037 A181300 * A326649 A050914 A017961
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 26 2019
STATUS
approved