exp(arctanh(x)+tanh(x)) = 1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5...

A013184

exp(arctanh(x)+tanh(x)) = 1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5...

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =72a(6) =544a(7) =3936a(8) =25344a(9) =193920a(10) =1920384a(11) =21876736a(12) =246359040a(13) =2967878656a(14) =39508168704a(15) =589063146496

External references