sech(sec(x)*sinh(x))=1-1/2!*x^2-11/4!*x^4-37/6!*x^6+7145/8!*x^8...

A012820

sech(sec(x)*sinh(x))=1-1/2!*x^2-11/4!*x^4-37/6!*x^6+7145/8!*x^8...

Terms

    a(0) =1a(1) =-1a(2) =-11a(3) =-37a(4) =7145a(5) =450711a(6) =-3070179a(7) =-4923539597a(8) =-586954253103

External references