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

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =32a(5) =240a(6) =2192a(7) =23856a(8) =303872a(9) =4427520a(10) =72545792a(11) =1320608256a(12) =26445350912a(13) =577722163200