147240

Appears in sequences

• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=19A005353
• a(n) is the number of edges (one-dimensional faces) in the convex polytope of real n X n doubly stochastic matrices.at n=6A059760
• Number of ways to place 6 nonattacking amazons (superqueens) on a 6 X n board.at n=15A174645
• Number of strings of numbers x(i=1..7) in 0..n with sum i^3*x(i)^2 equal to 343*n^2.at n=34A184308
• Number of ordered pairs of edge-disjoint trees on n labeled vertices.at n=5A291952