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

A025167

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

Terms

    a(0) =1a(1) =3a(2) =17a(3) =139a(4) =1473a(5) =19091a(6) =291793a(7) =5129307a(8) =101817089a(9) =2250495523a(10) =54780588561

External references