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 A218761 #6 Jul 11 2023 08:00:22 %S A218761 7,47,403,2942,22439,170148,1291662,9807350,74441043,565067801, %T A218761 4289417212,32560993753,247169557952,1876254744847,14242588588406, %U A218761 108115048685864,820697944019795,6229892072413748,47290913215565827 %N A218761 Unmatched value maps: number of n X 4 binary arrays indicating the locations of corresponding elements not equal to any horizontal or vertical neighbor in a random 0..1 n X 4 array. %C A218761 Column 4 of A218765. %H A218761 R. H. Hardin, <a href="/A218761/b218761.txt">Table of n, a(n) for n = 1..49</a> %e A218761 Some solutions for n=3 %e A218761 ..1..0..0..0....0..0..0..1....0..1..0..1....0..0..1..0....1..0..1..1 %e A218761 ..0..0..0..1....0..0..0..1....0..0..0..0....1..0..0..0....0..0..0..0 %e A218761 ..0..0..0..0....1..1..0..0....1..0..1..0....0..0..1..0....1..0..0..0 %Y A218761 Cf. A218765. %K A218761 nonn %O A218761 1,1 %A A218761 _R. H. Hardin_, Nov 05 2012