250380

Appears in sequences

• Number of ways to place 2 nonattacking nightriders on an n X n board.at n=26A172141
• Sum of the smallest parts of the partitions of 4n into 4 parts.at n=37A238702
• Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=18A253837