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

A012188

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

Terms

    a(0) =1a(1) =-2a(2) =16a(3) =-272a(4) =256a(5) =1758208a(6) =-549115904a(7) =178127730688

External references