E.g.f. (1-3x)/(1-3x-x^2).

A052635

E.g.f. (1-3x)/(1-3x-x^2).

Terms

    a(0) =1a(1) =0a(2) =2a(3) =18a(4) =240a(5) =3960a(6) =78480a(7) =1814400a(8) =47940480a(9) =1425029760a(10) =47065536000

External references