G.f.: Sum_{n>=1} (2 - (1-x)^n) * (1 - (1-x)^n)^(n-1) / (1-x)^(n^2).
A220231
G.f.: Sum_{n>=1} (2 - (1-x)^n) * (1 - (1-x)^n)^(n-1) / (1-x)^(n^2).
Terms
- a(0) =1a(1) =4a(2) =22a(3) =184a(4) =2094a(5) =30300a(6) =532918a(7) =11041936a(8) =263451958a(9) =7114155240a(10) =214501732236
External references
- oeis: A220231