a(n) = Sum_{k=0..n} binomial(n,k)^3 * Stirling2(2*k,k) * Stirling2(2*n-2*k,n-k).
A384472
a(n) = Sum_{k=0..n} binomial(n,k)^3 * Stirling2(2*k,k) * Stirling2(2*n-2*k,n-k).
Terms
- a(0) =1a(1) =2a(2) =22a(3) =558a(4) =25506a(5) =1770300a(6) =166190354a(7) =19647687682
External references
- oeis: A384472