A026994 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026692.

1, 8, 55, 348, 2089, 10930, 59507, 303260, 1541766, 7603878, 39661955, 193854488, 942975507, 4575005798, 23493563115, 113291185280, 541966221369, 2614491663880, 13324328958963, 63919218781860, 303531944623232, 1461173082833662, 7413731116928658, 35490915453285426

Offset

3,2

Links

Table of n, a(n) for n=3..26.

Crossrefs

Sequence in context: A116885 A179407 A244501 * A110184 A013698 A154245

Adjacent sequences: A026991 A026992 A026993 * A026995 A026996 A026997

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 21 2019

Status

approved