arctanh(sin(arctanh(x))) = x + (3/3!)*x^3 + (49/5!)*x^5 + (1915/7!)*x^7 + (136225/9!)*x^9 + ...

A012059

arctanh(sin(arctanh(x))) = x + (3/3!)*x^3 + (49/5!)*x^5 + (1915/7!)*x^7 + (136225/9!)*x^9 + ...

Terms

    a(0) =1a(1) =3a(2) =49a(3) =1915a(4) =136225a(5) =15321875a(6) =2499086225a(7) =557414129675

External references