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 A206882 #7 Jul 22 2025 19:46:17 %S A206882 65,4225,105936,2276625,56006452,1455584860,37121455086,933389392995, %T A206882 23502259683934,593617743280100,14997131474172367,378662158472685372, %U A206882 9559398762581848139,241351966658699739066,6093846582029230600582 %N A206882 Number of nX7 0..1 arrays avoiding 0 1 0 horizontally and 1 0 1 vertically. %C A206882 Column 7 of A206883 %H A206882 R. H. Hardin, <a href="/A206882/b206882.txt">Table of n, a(n) for n = 1..210</a> %e A206882 Some solutions for n=4 %e A206882 ..1..0..0..1..1..0..1....0..1..1..1..0..1..1....1..0..1..1..1..0..0 %e A206882 ..0..1..1..0..0..1..1....1..0..0..0..1..1..0....0..1..1..1..1..0..1 %e A206882 ..0..0..0..0..0..1..1....0..0..0..0..1..1..0....0..1..1..1..0..1..1 %e A206882 ..1..0..0..0..0..0..0....0..0..0..1..1..1..0....0..0..1..1..0..0..1 %K A206882 nonn %O A206882 1,1 %A A206882 _R. H. Hardin_ Feb 13 2012