exp(arcsinh(arctanh(x)))=1+x+1/2!*x^2+2/3!*x^3+5/4!*x^4+24/5!*x^5...

A012254

exp(arcsinh(arctanh(x)))=1+x+1/2!*x^2+2/3!*x^3+5/4!*x^4+24/5!*x^5...

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =24a(6) =109a(7) =720a(8) =4521a(9) =40320a(10) =330681a(11) =3628800a(12) =36468717a(13) =479001600a(14) =5721101541a(15) =87178291200

External references