A183285 Half the number of nX4 binary arrays with the number of 1-1 horizontal, vertical, diagonal and antidiagonal adjacencies equal to the number of 0-0 adjacencies

2, 18, 180, 2184, 28440, 385316, 5358022, 75912216, 1090973732, 15858156696, 232676544078, 3440947655952, 51232791119120, 767336873453826, 11552848716881830, 174745834818648930, 2654168057004043584

Offset

1,1

Comments

Column 4 of A183289

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 4X4 with a(1,1)=0
..0..1..0..0....0..0..0..0....0..1..0..1....0..1..0..0....0..0..0..1
..1..0..1..1....0..0..1..0....1..1..1..1....1..0..1..1....1..0..1..1
..0..1..0..0....1..1..1..1....0..0..0..1....0..1..1..0....1..0..1..1
..1..1..0..1....1..0..1..0....1..0..0..0....0..0..0..1....1..0..0..0

Crossrefs

Sequence in context: A099044 A161122 A019581 * A359458 A129627 A279860

Adjacent sequences: A183282 A183283 A183284 * A183286 A183287 A183288

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved