Expansion of e.g.f. arcsinh(x)/(1 - x).

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =20a(5) =109a(6) =654a(7) =4353a(8) =34824a(9) =324441a(10) =3244410a(11) =34795485a(12) =417545820a(13) =5536151685a(14) =77506123590