arctanh(exp(x)-sech(x))=x+2/2!*x^2+3/3!*x^3+20/4!*x^4+165/5!*x^5...
A013340
arctanh(exp(x)-sech(x))=x+2/2!*x^2+3/3!*x^3+20/4!*x^4+165/5!*x^5...
Terms
- a(0) =0a(1) =1a(2) =2a(3) =3a(4) =20a(5) =165a(6) =1142a(7) =10983a(8) =136040a(9) =1753545a(10) =25376042a(11) =422373963a(12) =7641560060a(13) =149590274925
External references
- oeis: A013340