sech(sinh(x)+tan(x))=1-4/2!*x^2+56/4!*x^4-1798/6!*x^6+107880/8!*x^8...

A013055

sech(sinh(x)+tan(x))=1-4/2!*x^2+56/4!*x^4-1798/6!*x^6+107880/8!*x^8...

Terms

    a(0) =1a(1) =-4a(2) =56a(3) =-1798a(4) =107880a(5) =-10378106a(6) =1464480244a(7) =-284901103638

External references