A215873 Number of permutations of 0..floor((5*n-2)/2) on odd squares of an 5Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.

1, 1, 1, 4, 20, 189, 1642, 26451, 307874, 7027942, 98057806, 2850280812, 44974137856

Offset: 1

Author

R. H. Hardin Aug 25 2012

Keywords

• nonn

Comments

Row 5 of A215870

Examples

			Some solutions for n=5
..x..0..x..2..x....x..0..x..1..x....x..0..x..1..x....x..0..x..2..x
..1..x..3..x..5....2..x..3..x..5....2..x..3..x..5....1..x..3..x..5
..x..4..x..7..x....x..4..x..7..x....x..4..x..6..x....x..4..x..6..x
..6..x..8..x..9....6..x..8..x.10....7..x..8..x.10....7..x..8..x..9
..x.10..x.11..x....x..9..x.11..x....x..9..x.11..x....x.10..x.11..x