A229415 Number of n X n 0..2 zero-diagonal arrays with corresponding row and column sums equal.

1, 3, 45, 4743, 3801411, 23938685973, 1215663478473627

Offset: 1

Author

R. H. Hardin Sep 22 2013

Keywords

• nonn

Comments

Column 2 of A229417

Examples

			Some solutions for n=4
..0..1..2..1....0..1..2..0....0..0..2..0....0..1..1..2....0..2..0..1
..2..0..2..0....2..0..0..0....2..0..1..0....0..0..2..0....2..0..0..1
..0..2..0..2....0..1..0..1....0..2..0..1....2..1..0..2....0..1..0..0
..2..1..0..0....1..0..0..0....0..1..0..0....2..0..2..0....1..0..1..0