E.g.f. (x*tan(x)-x^2)/8 (even powers only).

A117415

E.g.f. (x*tan(x)-x^2)/8 (even powers only).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =12a(4) =272a(5) =9920a(6) =530688a(7) =39144448a(8) =3807514624a(9) =472197021696

External references