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 A207916 #7 Jul 22 2025 20:59:35 %S A207916 19,361,1675,13759,86255,612439,4105063,28280693,192317491,1315659479, %T A207916 8974817871,61305336781,418503254641,2857795269701,19511966375659, %U A207916 133229220360041,909670357985593,6211195191847723,42409515649083757 %N A207916 Number of nX6 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically. %C A207916 Column 6 of A207918 %H A207916 R. H. Hardin, <a href="/A207916/b207916.txt">Table of n, a(n) for n = 1..210</a> %e A207916 Some solutions for n=4 %e A207916 ..0..0..1..1..1..0....1..0..0..1..0..0....0..1..1..0..0..1....1..1..1..0..0..1 %e A207916 ..1..0..0..1..1..0....0..1..1..1..0..0....0..0..1..1..1..1....1..1..0..0..1..0 %e A207916 ..1..0..0..1..1..0....0..1..1..1..0..0....1..0..0..1..1..1....1..0..0..1..1..0 %e A207916 ..1..1..0..0..1..1....0..1..0..0..1..0....1..1..0..0..1..1....0..0..1..1..0..0 %K A207916 nonn %O A207916 1,1 %A A207916 _R. H. Hardin_ Feb 21 2012