a(n) = Stirling2(2*n, n)*(2*n)!/(n+1)!.
A390727
a(n) = Stirling2(2*n, n)*(2*n)!/(n+1)!.
Terms
- a(0) =1a(1) =1a(2) =28a(3) =2700a(4) =571536a(5) =214326000a(6) =125799886080
External references
- oeis: A390727
A390727
a(n) = Stirling2(2*n, n)*(2*n)!/(n+1)!.