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 A184461 #7 Jan 15 2022 21:38:47 %S A184461 26,244,3090,42874,616534,9016218,133687638,2002023718,30215911640, %T A184461 458822048550,7001737409868,107286031628502,1649589497350886, %U A184461 25437988001627234,393268526198504728,6093317202558667778 %N 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. %C A184461 Column 3 of A184467. %H A184461 R. H. Hardin, <a href="/A184461/b184461.txt">Table of n, a(n) for n = 1..200</a> %e A184461 Some solutions for 3 X 4 %e A184461 ..0..1..1..1....0..1..1..1....0..0..1..0....0..0..1..1....0..0..1..0 %e A184461 ..0..0..0..1....1..0..0..1....1..1..1..0....1..0..1..0....0..1..0..1 %e A184461 ..0..1..1..1....1..1..0..0....0..0..0..0....1..1..0..0....1..0..1..1 %e A184461 ... %e A184461 ...M..E..P.......E..E..P.......E..P..E.......M..E..P.......M..E..E... %e A184461 ...M..E..P.......P..M..M.......E..E..M.......P..E..M.......E..E..P... %Y A184461 Cf. A184467. %K A184461 nonn %O A184461 1,1 %A A184461 _R. H. Hardin_, Jan 15 2011