A207655 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically

2, 16, 84, 870, 13902, 264568, 12327618, 1144562438, 64916691796, 20511370392174, 15431327748576322, 2046762983891357336, 5203964479172695849850, 32433326970178563780859912

Offset

1,1

Comments

Diagonal of A207661

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A207340 A207768 A207891 * A071893 A220505 A370192

Adjacent sequences: A207652 A207653 A207654 * A207656 A207657 A207658

Keyword

nonn

Author

R. H. Hardin Feb 19 2012

Status

approved