Expansion of e.g.f. exp(arctanh(sinh(x))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =13a(5) =76a(6) =421a(7) =3424a(8) =26713a(9) =277456a(10) =2794441a(11) =35345344a(12) =436186213a(13) =6504742336a(14) =95033434861