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 A218845 #6 Jul 23 2025 00:07:16 %S A218845 1,65,436,3617,26635,201960,1530846,11617859,88207678,669575111, %T A218845 5082650645,38581655789,292872656082,2223190550341,16876170296292, %U A218845 128106451991984,972451948238336,7381852115978817,56035406540101182 %N A218845 Unmatched value maps: number of 4Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 4Xn array. %C A218845 Row 4 of A218842 %H A218845 R. H. Hardin, <a href="/A218845/b218845.txt">Table of n, a(n) for n = 1..37</a> %e A218845 Some solutions for n=3 %e A218845 ..0..0..1....1..0..0....1..0..0....1..0..0....1..1..0....0..0..1....1..1..0 %e A218845 ..1..0..0....1..0..1....1..0..1....0..0..0....0..0..1....0..0..0....0..0..1 %e A218845 ..0..1..1....1..0..0....0..0..1....0..0..1....1..0..0....1..0..0....1..0..0 %e A218845 ..1..1..1....0..1..1....0..0..1....0..0..0....1..0..1....1..0..0....1..0..0 %K A218845 nonn %O A218845 1,2 %A A218845 _R. H. Hardin_ Nov 07 2012