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 A207003 #7 Jul 22 2025 19:55:53 %S A207003 33,1089,16109,211471,3032756,45723467,683241763,10070110597, %T A207003 148233534913,2188626118244,32347115051263,477836040550545, %U A207003 7056110017685369,104200645149581597,1538926599002070335 %N A207003 Number of 6Xn 0..1 arrays avoiding 0 1 0 horizontally and 0 1 1 vertically. %C A207003 Row 6 of A207000 %H A207003 R. H. Hardin, <a href="/A207003/b207003.txt">Table of n, a(n) for n = 1..210</a> %e A207003 Some solutions for n=4 %e A207003 ..0..0..1..1....1..1..0..0....0..0..0..0....1..1..1..1....1..0..1..1 %e A207003 ..0..0..1..1....0..1..1..1....1..1..0..0....1..1..1..1....0..0..0..0 %e A207003 ..0..0..1..1....1..1..0..0....0..0..0..1....1..1..1..1....1..0..1..1 %e A207003 ..1..1..0..1....0..1..1..1....0..1..1..0....1..1..1..0....0..0..0..0 %e A207003 ..0..0..1..1....1..0..0..0....1..0..0..0....1..0..1..1....1..0..1..1 %e A207003 ..1..0..0..0....0..1..1..0....0..0..0..0....1..1..0..0....0..0..0..0 %K A207003 nonn %O A207003 1,1 %A A207003 _R. H. Hardin_ Feb 14 2012