a(n) = n! [x^n] LW(T(x)), where T(x) = -W(-x) Euler's tree function, W(x) is the Lambert W function, and LW(x) = W(-W(x))/(-W(x)) (A340473).
A340474
a(n) = n! [x^n] LW(T(x)), where T(x) = -W(-x) Euler's tree function, W(x) is the Lambert W function, and LW(x) = W(-W(x))/(-W(x)) (A340473).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =22a(4) =209a(5) =2756a(6) =43717a(7) =839686a(8) =18581425a(9) =470707192a(10) =13352676101a(11) =420875581754
External references
- oeis: A340474