E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/3*x^3*exp(x*exp(x*exp(x)))^3).

A060913

E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/3*x^3*exp(x*exp(x*exp(x)))^3).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =18a(4) =157a(5) =1656a(6) =20727a(7) =300784a(8) =4955337a(9) =91229616a(10) =1853584651a(11) =41147256624a(12) =989990665677

External references