First differences of A265908; second differences of A265907.

A275963

First differences of A265908; second differences of A265907.

Terms

    a(0) =18a(1) =234a(2) =2244a(3) =22098a(4) =237594a(5) =2743164a(6) =33556818a(7) =441925794a(8) =12449045364a(9) =267703255698

External references