413640

Appears in sequences

• Number of ordered pairs of permutations generating a transitive group.at n=5A122949
• G.f. A(x) satisfies: A(x)^2 = A(x^2) + 12*x.at n=7A264413
• G.f.: Product_{k>=1} (1 + 2*x^(k^2)) / (1-x^k).at n=42A280224
• Triangular array read by rows: T(n,k) is the number of ordered pairs of n-permutations that generate a group with exactly k orbits, 0 <= k <= n, n >= 0.at n=22A327547