E.g.f. (1/2) * tan(x)^2 (even powers only).

A024283

E.g.f. (1/2) * tan(x)^2 (even powers only).

Terms

    a(0) =0a(1) =1a(2) =8a(3) =136a(4) =3968a(5) =176896a(6) =11184128a(7) =951878656a(8) =104932671488

External references