G.f.: exp( Sum_{n>=1} 2*Pell(n)^(2*n) * x^n/n ), where Pell(n) = A000129(n).
A208056
G.f.: exp( Sum_{n>=1} 2*Pell(n)^(2*n) * x^n/n ), where Pell(n) = A000129(n).
Terms
- a(0) =1a(1) =2a(2) =18a(3) =10450a(4) =215011842
External references
- oeis: A208056