11430720

Appears in sequences

• Number of permutations of n elements divided by the number of (binary) heaps on n+1 elements.at n=23A133385
• Triangle T(n, k) = n!*StirlingS2(n, k)/binomial(n, k), read by rows.at n=51A156815
• Expansion of (x*exp(x)/(exp(x)-1))^3 = sum(n>=0, a(n)/(n!*(n+1)!)*x^n).at n=9A191577
• Triangular array read by rows: T(n,k) is the number of functions f:{1,2,...,n} -> {1,2,...,n} that have exactly k nonrecurrent elements; n>=1, 0<=k<=n-1.at n=38A219694
• Triangular table read by rows: T(n,k) is the k-th entry of the main diagonal of the inverse Hilbert matrix of order n.at n=30A348419