arctan(sinh(x)*sin(x))=2/2!*x^2-248/6!*x^6+766112/10!*x^10...

A012527

arctan(sinh(x)*sin(x))=2/2!*x^2-248/6!*x^6+766112/10!*x^10...

Terms

    a(0) =2a(1) =-248a(2) =766112a(3) =-13434220928

External references