A184464 - OEIS

%I #5 Mar 31 2012 12:36:00

%S 1212,89908,9016218,986306398,112210745828,13061240432092,

%T 1543735290815166,184478487695574108,22229843879368216722,

%U 2696248965558609295818,328747622872812708911124

%N Half the number of (n+1)X7 binary arrays with equal numbers of majority one 2X2 subblocks and majority zero 2X2 subblocks

%C Column 6 of A184467

%H R. H. Hardin, <a href="/A184464/b184464.txt">Table of n, a(n) for n = 1..53</a>

%e Some solutions for 3X7

%e ..0..1..1..1..0..0..0....0..0..0..0..0..0..1....0..1..1..1..0..0..0

%e ..1..0..0..1..1..1..1....1..1..0..1..1..1..0....0..0..1..0..0..1..1

%e ..1..0..0..0..0..0..0....0..0..1..0..1..1..0....1..0..1..1..1..0..1

%e ...

%e ...E..E..P..P..E..E.......E..M..M..E..E..E.......M..P..P..M..M..E...

%e ...E..M..M..E..E..E.......E..E..E..P..P..E.......M..E..P..E..E..P...

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 15 2011