E.g.f.: T(T(T(x))), where T(x) = -LambertW(-x) is Euler's tree function (A000169).

A227278

E.g.f.: T(T(T(x))), where T(x) = -LambertW(-x) is Euler's tree function (A000169).

Terms

    a(0) =1a(1) =6a(2) =63a(3) =948a(4) =18645a(5) =454158a(6) =13221075a(7) =448434136a(8) =17386204761a(9) =759123121050

External references