E.g.f. equals the series reversion of x - x*arctanh(x).

A227461

E.g.f. equals the series reversion of x - x*arctanh(x).

Terms

    a(0) =1a(1) =2a(2) =12a(3) =128a(4) =1920a(5) =37104a(6) =877184a(7) =24520320a(8) =791112960a(9) =28932902400

External references