sin(sin(arctanh(x)))=x-4/5!*x^5-136/7!*x^7-7408/9!*x^9-644416/11!*x^11...

A012052

sin(sin(arctanh(x)))=x-4/5!*x^5-136/7!*x^7-7408/9!*x^9-644416/11!*x^11...

Terms

    a(0) =1a(1) =0a(2) =-4a(3) =-136a(4) =-7408a(5) =-644416a(6) =-84562880a(7) =-15811723136

External references