A207768 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

2, 16, 84, 828, 11950, 195160, 6513576, 364308938, 15284596082, 2700018736020, 787454317079753, 72216754252055376, 73270546375550142283, 119728540088330705652453, 22114539991379386419299095

Offset: 1

Author

R. H. Hardin Feb 20 2012

Keywords

• nonn

Comments

Diagonal of A207774

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..18