G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(2^k*x) - 1]^k/k ).
A156907
G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(2^k*x) - 1]^k/k ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =18a(4) =476a(5) =38358a(6) =11363548a(7) =15060027956
External references
- oeis: A156907
A156907
G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(2^k*x) - 1]^k/k ).