G.f.: exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^n * x^k] * x^n/n ), an integer series in x.
A166894
G.f.: exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^n * x^k] * x^n/n ), an integer series in x.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =89a(6) =1050a(7) =28983a(8) =2066217a(9) =272159513a(10) =56735786726
External references
- oeis: A166894