G.f.: ( Sum_{n>=0} (2*n+x)^n * x^n / (1 + 2*n*x + x^2)^n )^(1/2).
A226045
G.f.: ( Sum_{n>=0} (2*n+x)^n * x^n / (1 + 2*n*x + x^2)^n )^(1/2).
Terms
- a(0) =1a(1) =1a(2) =6a(3) =44a(4) =430a(5) =5162a(6) =72890a(7) =1178978a(8) =21449704a(9) =433116488a(10) =9606793874a(11) =232145293502
External references
- oeis: A226045