G.f.: Sum_{n>=0} (1 + (1 + 2*x)^n)^n / 2^(2*n+1).
A300281
G.f.: Sum_{n>=0} (1 + (1 + 2*x)^n)^n / 2^(2*n+1).
Terms
- a(0) =1a(1) =3a(2) =41a(3) =967a(4) =32109a(5) =1373603a(6) =71889889a(7) =4448939407a(8) =317785091933
External references
- oeis: A300281