A027234 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026758.

1, 9, 62, 320, 1837, 8376, 45666, 198471, 1065418, 4523403, 24247545, 101589616, 547233490, 2273356598, 12341618508, 50963502172, 279167141052, 1147495086055, 6344204700832, 25979651242434, 144938080884808, 591635283209270, 3328970814605391, 13551109648829458, 76853618775913752

Offset

3,2

Links

Table of n, a(n) for n=3..27.

Crossrefs

Sequence in context: A264376 A328955 A098921 * A081574 A084151 A346396

Adjacent sequences: A027231 A027232 A027233 * A027235 A027236 A027237

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 24 2019

Status

approved