A188807 Number of nX4 array permutations with each element remaining in its original row or its original column.

24, 1313, 194568, 72104097, 57951767544

Offset: 1

Author

R. H. Hardin Apr 11 2011

Keywords

• nonn

Comments

Column 4 of A188808

Examples

			Some solutions for 3X4
..1..9..6..0....1..9..3..0....0..1..2.11....3..9..6..2....0..1..3..7
..8..4..7..3....6..4.10..5....7..5..4..3....0..5..4..7....5..6..2..4
.10..5..2.11...11..8..2..7...10..9..6..8...10..1.11..8....9..8.10.11