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

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

Offset

1,1

Comments

Column 2 of A229870

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A009066 A279832 A012012 * A305843 A192341 A191511

Adjacent sequences: A229863 A229864 A229865 * A229867 A229868 A229869

Keyword

nonn

Author

R. H. Hardin, Oct 01 2013

Status

approved