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 A218846 #6 Jul 23 2025 00:07:27 %S A218846 1,200,2043,28888,346501,4299802,53372068,663615890,8258480840, %T A218846 102739744908,1278038244556,15897575084961,197757402894222, %U A218846 2460009603174968,30601283457873781,380663991433804098 %N A218846 Unmatched value maps: number of 5Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 5Xn array. %C A218846 Row 5 of A218842 %H A218846 R. H. Hardin, <a href="/A218846/b218846.txt">Table of n, a(n) for n = 1..42</a> %e A218846 Some solutions for n=3 %e A218846 ..1..1..0....1..0..0....0..0..1....1..0..0....0..0..0....0..0..1....1..1..0 %e A218846 ..0..0..1....0..1..1....0..0..0....1..0..1....1..0..0....1..1..1....0..0..1 %e A218846 ..1..0..1....1..1..0....0..1..1....1..1..1....0..1..0....1..0..0....1..1..0 %e A218846 ..0..0..1....0..0..1....1..0..1....1..0..1....0..0..1....0..1..0....0..0..0 %e A218846 ..1..0..0....0..0..1....0..0..0....0..0..1....1..0..0....0..0..1....0..0..0 %K A218846 nonn %O A218846 1,2 %A A218846 _R. H. Hardin_ Nov 07 2012