A207544 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal.

3, 81, 14974, 18584111, 151596413811, 8153351029428092, 2876868686935789680075, 6662940552094334528016043729, 101291421007307048419298014635301970

Offset: 1

Author

R. H. Hardin Feb 18 2012

Keywords

• nonn

Comments

Diagonal of A207550

Examples

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