A184461 Half the number of (n+1) X 4 binary arrays with equal numbers of majority one 2 X 2 subblocks and majority zero 2 X 2 subblocks.

26, 244, 3090, 42874, 616534, 9016218, 133687638, 2002023718, 30215911640, 458822048550, 7001737409868, 107286031628502, 1649589497350886, 25437988001627234, 393268526198504728, 6093317202558667778

Offset

1,1

Comments

Column 3 of A184467.

Links

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

Example

Some solutions for 3 X 4
..0..1..1..1....0..1..1..1....0..0..1..0....0..0..1..1....0..0..1..0
..0..0..0..1....1..0..0..1....1..1..1..0....1..0..1..0....0..1..0..1
..0..1..1..1....1..1..0..0....0..0..0..0....1..1..0..0....1..0..1..1
...
...M..E..P.......E..E..P.......E..P..E.......M..E..P.......M..E..E...
...M..E..P.......P..M..M.......E..E..M.......P..E..M.......E..E..P...

Crossrefs

Cf. A184467.

Sequence in context: A245873 A275880 A020537 * A088889 A348490 A060105

Adjacent sequences: A184458 A184459 A184460 * A184462 A184463 A184464

Keyword

nonn

Author

R. H. Hardin, Jan 15 2011

Status

approved