G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k*(n-k))/2 ).
A228852
G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k*(n-k))/2 ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =14a(4) =382a(5) =38344a(6) =12990279a(7) =14369538529
External references
- oeis: A228852