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 A218841 #6 Jul 23 2025 00:06:55 %S A218841 37,1220,44129,1530846,53372068,1858438456,64756459689,2256078606791, %T A218841 78598915311375,2738314667345978,95400355881324823, %U A218841 3323658089304061344,115793113908855836331,4034122981125875986810,140545041981707228122666 %N A218841 Unmatched value maps: number of nX7 binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 nX7 array. %C A218841 Column 7 of A218842 %H A218841 R. H. Hardin, <a href="/A218841/b218841.txt">Table of n, a(n) for n = 1..20</a> %e A218841 Some solutions for n=3 %e A218841 ..0..0..1..0..0..0..1....0..0..0..1..1..0..0....0..0..1..1..0..0..1 %e A218841 ..1..0..0..0..0..0..0....0..1..0..0..0..0..1....0..0..0..0..1..0..0 %e A218841 ..0..1..1..1..0..0..0....0..0..0..1..1..0..0....0..0..0..1..0..0..1 %K A218841 nonn %O A218841 1,1 %A A218841 _R. H. Hardin_ Nov 07 2012