A206953 Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row, column or nw-to-se diagonal.

69, 4761, 218637, 9803278, 449797912, 20694430627, 950821989599, 43676385937074, 2006497292305518, 92180116069921220, 4234783426805045787, 194547099770290413016, 8937559013725835053331, 410594472108308448412855

Offset: 1

Author

R. H. Hardin Feb 13 2012

Keywords

• nonn

Comments

Column 4 of A206957

Examples

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

Links

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