A202712 Number of n X n 0..2 arrays with row sums equal and no column sum equal to the previous.

3, 10, 624, 173860, 421158558, 8496020082856

Offset

1,1

Comments

Column 2 of A202714

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=3
..0..2..1....1..1..1....0..0..2....0..2..2....0..1..1....2..0..0....1..0..2
..0..2..1....1..2..0....2..0..0....0..2..2....2..0..0....0..2..0....2..1..0
..1..1..1....2..0..1....2..0..0....1..1..2....0..0..2....2..0..0....0..1..2

Crossrefs

Sequence in context: A004100 A349894 A103156 * A006273 A183130 A382795

Adjacent sequences: A202709 A202710 A202711 * A202713 A202714 A202715

Keyword

nonn

Author

R. H. Hardin, Dec 23 2011

Status

approved