sin(sec(x)-sech(x))=2/2!*x^2+2/6!*x^6-176158/10!*x^10...

A013504

sin(sec(x)-sech(x))=2/2!*x^2+2/6!*x^6-176158/10!*x^10...

Terms

    a(0) =2a(1) =2a(2) =-176158a(3) =-1468303198

External references