A229866 Number of n X n 0..2 arrays with corresponding row and column sums equal.

3, 27, 1215, 384183, 923742873, 17451302074317, 2658656027421822249

Offset: 1

Author

R. H. Hardin, Oct 01 2013

Keywords

• nonn

Comments

Column 2 of A229870

Examples

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