G.f.: exp( Sum_{n>=1} 2*Pell(n)^4 * x^n/n ), where Pell(n) = A000129(n).
A208055
G.f.: exp( Sum_{n>=1} 2*Pell(n)^4 * x^n/n ), where Pell(n) = A000129(n).
Terms
- a(0) =1a(1) =2a(2) =18a(3) =450a(4) =11362a(5) =311426a(6) =8857426a(7) =259072706a(8) =7730804098a(9) =234255654466
External references
- oeis: A208055