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 A208371 #7 Jul 22 2025 21:18:18 %S A208371 14,196,1162,9338,67396,507682,3759574,28035840,208473118,1552012966, %T A208371 11548657932,85951552302,639647232518,4760383071360,35427236540514, %U A208371 263654460924470,1962148860235116,14602566762555450,108674155940051534 %N A208371 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 0 vertically. %C A208371 Row 5 of A208369 %H A208371 R. H. Hardin, <a href="/A208371/b208371.txt">Table of n, a(n) for n = 1..210</a> %F A208371 Empirical: a(n) = a(n-1) +41*a(n-2) +78*a(n-3) -153*a(n-4) -363*a(n-5) +253*a(n-6) +566*a(n-7) -276*a(n-8) -324*a(n-9) +165*a(n-10) +29*a(n-11) -15*a(n-12) %e A208371 Some solutions for n=4 %e A208371 ..0..1..0..0....0..1..1..0....1..1..1..0....1..1..1..1....0..1..1..1 %e A208371 ..1..1..1..1....1..0..1..0....0..1..1..0....1..1..1..1....1..1..0..0 %e A208371 ..1..1..1..1....1..1..0..0....1..1..0..0....0..1..0..1....1..0..1..0 %e A208371 ..1..0..1..1....1..1..1..0....1..0..1..0....1..1..1..0....1..1..1..0 %e A208371 ..1..0..1..0....1..1..1..0....0..1..1..0....1..0..1..0....1..1..1..0 %K A208371 nonn %O A208371 1,1 %A A208371 _R. H. Hardin_ Feb 25 2012