E.g.f.: Sum_{n>=0} arctanh(n*x)^n/n!.
A221079
E.g.f.: Sum_{n>=0} arctanh(n*x)^n/n!.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =29a(4) =384a(5) =8009a(6) =222272a(7) =8007621a(8) =368537600a(9) =20666061201
External references
- oeis: A221079
A221079
E.g.f.: Sum_{n>=0} arctanh(n*x)^n/n!.