G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k^2) * x^k ).
A206850
G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k^2) * x^k ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =56a(6) =522a(7) =5972a(8) =424954a(9) =16560881a(10) =1528544877a(11) =483389731955
External references
- oeis: A206850