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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =24a(6) =109a(7) =552a(8) =3177a(9) =28032a(10) =227961a(11) =1778688a(12) =15773229a(13) =212383872a(14) =2521786149a(15) =25215328512a(16) =294715261521