E.g.f. A(x) satisfies A(x) = exp( arctanh(x * A(x)) / A(x) ).

A385502

E.g.f. A(x) satisfies A(x) = exp( arctanh(x * A(x)) / A(x) ).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =25a(5) =205a(6) =2001a(7) =25991a(8) =394353a(9) =6718041a(10) =130319745a(11) =2833146987a(12) =67767170505

External references