A206859 Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.

69, 4761, 192575, 7598355, 314918295, 13093461017, 541018725304, 22336434688428, 923097673638406, 38158725414249736, 1577142038208976046, 65180147142970134040, 2693823565225042593429, 111334863067931222656792

Offset: 1

Author

R. H. Hardin Feb 13 2012

Keywords

• nonn

Comments

Column 4 of A206863

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210