A184460 Half the number of (n+1) X 3 binary arrays with equal numbers of majority one 2 X 2 subblocks and majority zero 2 X 2 subblocks.

7, 35, 244, 1693, 12324, 89908, 667600, 5002165, 37777626, 286971238, 2190689600, 16790412468, 129127710164, 995937115474, 7700689112570, 59672216385587, 463283019198236, 3602944011508868, 28062509230063226, 218870000234417062

Offset

1,1

Comments

Column 2 of A184467.

Links

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

Example

Some solutions for 5 X 3
..0..1..1....0..0..1....0..0..0....0..1..1....0..0..0....0..1..1....0..0..0
..0..1..1....0..1..0....1..1..0....0..1..0....0..1..1....0..0..0....0..1..0
..0..1..1....1..1..0....1..0..0....0..0..0....1..0..1....1..1..1....1..0..1
..0..0..0....0..1..0....1..1..1....1..1..1....0..0..1....0..1..0....1..1..0
..0..1..1....0..0..1....0..0..0....1..0..0....1..1..1....0..0..1....1..1..0
...
...E..P.......M..E.......E..M.......E..P.......M..E.......M..E.......M..M...
...E..P.......P..E.......P..M.......M..M.......E..P.......E..E.......E..E...
...M..E.......P..E.......P..E.......E..E.......M..E.......P..P.......P..E...
...M..E.......M..E.......E..E.......P..E.......E..P.......M..E.......P..E...

Crossrefs

Cf. A184467.

Sequence in context: A274073 A177261 A105926 * A382473 A096686 A165505

Adjacent sequences: A184457 A184458 A184459 * A184461 A184462 A184463

Keyword

nonn

Author

R. H. Hardin, Jan 15 2011

Status

approved