4630500

Appears in sequences

• Diagonal of (1 - 9 x y)/((1 - 3 y - 2 x + 3 y^2 + 9 x^2 y) * (1 - u - z) * (1 - v - w)).at n=4A268549
• a(n) = Product_{d|n, d<n} A019565(phi(d)), where phi is the Euler totient function A000010.at n=59A318834
• A variant of A322827.at n=44A322825
• a(n) = n^3*sigma_2(n).at n=21A386746
• Irregular triangular array read by rows: T(n,k) is the number of compatible pairs (f,g) of functions from [n] into [n] such that the integer partition induced by f and g is the k-th partition in the canonical (reverse lexicographic) ordering of the partitions, n>=0, 1<=k<=A000041(n).at n=38A390121