arcsinh(sec(x)*arctan(x))=x+28/5!*x^5-728/7!*x^7+54416/9!*x^9...

A012808

arcsinh(sec(x)*arctan(x))=x+28/5!*x^5-728/7!*x^7+54416/9!*x^9...

Terms

    a(0) =1a(1) =0a(2) =28a(3) =-728a(4) =54416a(5) =-5676352a(6) =900432960a(7) =-193766436992

External references