a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n*k,k).
A383120
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n*k,k).
Terms
- a(0) =1a(1) =2a(2) =11a(3) =139a(4) =2885a(5) =82381a(6) =2979565a(7) =130203494a(8) =6664589321a(9) =390857822425
External references
- oeis: A383120