A027233 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026758.

1, 7, 34, 184, 785, 4107, 16894, 88397, 358212, 1892182, 7609892, 40695540, 162938176, 882569071, 3523144085, 19320028921, 76956041950, 426863069443, 1697410759579, 9513773568608, 37779519792187, 213739273560729, 847809431322520, 4836704323382544, 19167125562029304

Offset

2,2

Links

Table of n, a(n) for n=2..26.

Crossrefs

Sequence in context: A080048 A177140 A372411 * A117650 A370618 A365474

Adjacent sequences: A027230 A027231 A027232 * A027234 A027235 A027236

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 24 2019

Status

approved