A184459 Half the number of (n+1)X2 binary arrays with equal numbers of majority one 2X2 subblocks and majority zero 2X2 subblocks

3, 7, 26, 91, 334, 1212, 4496, 16809, 63442, 240728, 918208, 3516450, 13515164, 52099024, 201356496, 779967713, 3027239338, 11769964920, 45833102224, 178726147558, 697817190692, 2727647007504, 10672911447056, 41801025679450

Offset

1,1

Comments

Column 1 of A184467

Links

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

Example

All solutions for 3X2
..0..0....0..0....0..0....0..1....0..1....0..1....0..1
..1..1....0..1....1..0....1..0....1..0....0..1....0..1
..0..0....1..1....1..1....1..0....0..1....1..0....0..1
...
...E.......M.......M.......E.......E.......E.......E...
...E.......P.......P.......E.......E.......E.......E...

Crossrefs

Sequence in context: A148741 A328280 A258311 * A215018 A069738 A057005

Adjacent sequences: A184456 A184457 A184458 * A184460 A184461 A184462

Keyword

nonn

Author

R. H. Hardin Jan 15 2011

Status

approved