A181218 Number of n X n binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally.

2, 16, 230, 10732, 1495392, 507962194, 493466099722, 1328921689649459, 9633695407844528952, 192630734231370260714836, 10572973250296811381776668634

Offset: 1

Author

R. H. Hardin Oct 10 2010

Keywords

• nonn

Comments

Diagonal of A181224

Examples

			Some avoided solutions for 3X3
..1..1..1....1..0..0....0..0..1....1..1..1....1..0..0....1..1..0....1..0..0
..0..0..0....0..1..1....0..1..0....0..0..1....0..0..0....0..1..0....1..0..0
..0..0..1....0..0..1....1..0..1....0..0..0....1..1..1....0..0..1....1..1..0