E.g.f. sinh(sin(arctan(x))) (odd powers only).

A012024

E.g.f. sinh(sin(arctan(x))) (odd powers only).

Terms

    a(0) =1a(1) =-2a(2) =16a(3) =-104a(4) =-20096a(5) =4427776a(6) =-954111872a(7) =243390205696

External references