arcsinh(sin(arctanh(x)))=x+4/5!*x^5-80/7!*x^7-3440/9!*x^9-764800/11!*x^11...

A012057

arcsinh(sin(arctanh(x)))=x+4/5!*x^5-80/7!*x^7-3440/9!*x^9-764800/11!*x^11...

Terms

    a(0) =1a(1) =0a(2) =4a(3) =-80a(4) =-3440a(5) =-764800a(6) =-107953600a(7) =-25833184000

External references