329462

Appears in sequences

• a(n) = Sum_{k=1..n} ((k-1)!)^2*Stirling2(n,k)^2.at n=5A048163
• Convolution of Catalan and Fibonacci numbers.at n=13A090826
• Array read by antidiagonals: poly-Bernoulli numbers B(-k,n).at n=60A099594
• Number of permutations of length n within distance 5.at n=10A154654
• Number of acyclic orientations of the Turán graph T(n,2).at n=10A266695
• Poly-Bernoulli numbers B_n^(k) with k = -5.at n=5A283811
• Number of permutations of [n] within distance floor(n/2) of a fixed permutation.at n=10A306267
• Number A(n,k) of acyclic orientations of the complete tripartite graph K_{n,n,k}; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=20A372254
• Number A(n,k) of acyclic orientations of the Turán graph T(k*n,n); square array A(n,k), n>=0, k>=1, read by antidiagonals.at n=30A372326