G.f.: A(x) = Sum_{n>=0} (1 + x)^(n^2) / 2^(n+1).
A173217
G.f.: A(x) = Sum_{n>=0} (1 + x)^(n^2) / 2^(n+1).
Terms
- a(0) =1a(1) =3a(2) =36a(3) =744a(4) =21606a(5) =807912a(6) =36948912a(7) =1997801520a(8) =124666314300
External references
- oeis: A173217
A173217
G.f.: A(x) = Sum_{n>=0} (1 + x)^(n^2) / 2^(n+1).