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

1,1

Comments

Diagonal of A207774

Links

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

Example

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

Crossrefs

Sequence in context: A207757 A283951 A207340 * A207891 A207655 A071893

Adjacent sequences: A207765 A207766 A207767 * A207769 A207770 A207771

Keyword

nonn

Author

R. H. Hardin Feb 20 2012

Status

approved