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 A207893 #7 Jul 22 2025 20:56:46 %S A207893 19,361,1080,6952,38160,205258,1153532,6420722,35306016,196164150, %T A207893 1088708030,6022687942,33388715092,185122745390,1025484329530, %U A207893 5683145307278,31499382991888,174545900126878,967280691347214 %N A207893 Number of nX6 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 0 and 1 1 1 vertically. %C A207893 Column 6 of A207895 %H A207893 R. H. Hardin, <a href="/A207893/b207893.txt">Table of n, a(n) for n = 1..210</a> %e A207893 Some solutions for n=4 %e A207893 ..0..1..0..0..1..0....0..0..1..0..0..1....0..1..0..0..1..0....0..0..1..1..0..0 %e A207893 ..0..1..1..1..0..0....1..0..0..1..1..1....0..0..1..1..0..0....1..1..0..0..1..1 %e A207893 ..1..0..0..1..1..1....1..1..0..0..1..0....1..0..0..1..1..1....0..0..1..0..0..1 %e A207893 ..0..0..1..0..0..1....0..1..1..1..0..0....1..1..0..0..1..0....0..1..1..1..1..0 %K A207893 nonn %O A207893 1,1 %A A207893 _R. H. Hardin_ Feb 21 2012