a(n) = Sum_{k=0..n} binomial(n,k)^3 * abs(Stirling1(2*k,k)) * abs(Stirling1(2*n-2*k,n-k)).
A384496
a(n) = Sum_{k=0..n} binomial(n,k)^3 * abs(Stirling1(2*k,k)) * abs(Stirling1(2*n-2*k,n-k)).
Terms
- a(0) =1a(1) =2a(2) =30a(3) =1044a(4) =68474a(5) =7180900a(6) =1050625720a(7) =196205015216
External references
- oeis: A384496