sech(arctanh(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-27/4!*x^4-60/5!*x^5...

A012720

sech(arctanh(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-27/4!*x^4-60/5!*x^5...

Terms

    a(0) =1a(1) =0a(2) =-1a(3) =-6a(4) =-27a(5) =-60a(6) =435a(7) =8750a(8) =84777a(9) =475272a(10) =-2114745a(11) =-106313438a(12) =-1794336819a(13) =-17317361204a(14) =18165128891

External references