G.f.: Sum_{n>=0} (1 + x)^(n*(n+1)/2) / 2^n.
A265937
G.f.: Sum_{n>=0} (1 + x)^(n*(n+1)/2) / 2^n.
Terms
- a(0) =2a(1) =4a(2) =24a(3) =248a(4) =3600a(5) =67296a(6) =1538672a(7) =41593920a(8) =1297683360a(9) =45891815040
External references
- oeis: A265937
A265937
G.f.: Sum_{n>=0} (1 + x)^(n*(n+1)/2) / 2^n.