a(n) = Sum_{k=0..n} binomial(n*k,k) * binomial(n*(n-k),n-k).
A358145
a(n) = Sum_{k=0..n} binomial(n*k,k) * binomial(n*(n-k),n-k).
Terms
- a(0) =1a(1) =2a(2) =16a(3) =258a(4) =6184a(5) =195660a(6) =7674144a(7) =358788696a(8) =19464910000
External references
- oeis: A358145