E.g.f.: tan(arctanh(x)*exp(x)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =36a(5) =285a(6) =2470a(7) =25891a(8) =304584a(9) =4116473a(10) =61307338a(11) =1011045759a(12) =18130445036a(13) =353222430613