E.g.f.: exp( exp(x) * (1 + x + x^2 / 2 + x^3 / 6) - 1 ).
A347666
E.g.f.: exp( exp(x) * (1 + x + x^2 / 2 + x^3 / 6) - 1 ).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =40a(4) =239a(5) =1648a(6) =12778a(7) =109476a(8) =1023520a(9) =10341878a(10) =112067820a(11) =1294254184a(12) =15847382977a(13) =204827368606
External references
- oeis: A347666