This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A184464 #7 Jul 22 2025 09:34:50 %S A184464 1212,89908,9016218,986306398,112210745828,13061240432092, %T A184464 1543735290815166,184478487695574108,22229843879368216722, %U A184464 2696248965558609295818,328747622872812708911124 %N A184464 Half the number of (n+1)X7 binary arrays with equal numbers of majority one 2X2 subblocks and majority zero 2X2 subblocks. %C A184464 Column 6 of A184467 %H A184464 R. H. Hardin, <a href="/A184464/b184464.txt">Table of n, a(n) for n = 1..53</a> %e A184464 Some solutions for 3X7 %e A184464 ..0..1..1..1..0..0..0....0..0..0..0..0..0..1....0..1..1..1..0..0..0 %e A184464 ..1..0..0..1..1..1..1....1..1..0..1..1..1..0....0..0..1..0..0..1..1 %e A184464 ..1..0..0..0..0..0..0....0..0..1..0..1..1..0....1..0..1..1..1..0..1 %e A184464 ... %e A184464 ...E..E..P..P..E..E.......E..M..M..E..E..E.......M..P..P..M..M..E... %e A184464 ...E..M..M..E..E..E.......E..E..E..P..P..E.......M..E..P..E..E..P... %K A184464 nonn %O A184464 1,1 %A A184464 _R. H. Hardin_ Jan 15 2011