E.g.f.: exp(1-sqrt(3-2*exp(x))).

Terms

a(0) =1a(1) =1a(2) =3a(3) =14a(4) =94a(5) =842a(6) =9519a(7) =130482a(8) =2105618a(9) =39124431a(10) =822878381a(11) =19327882796a(12) =501494558195