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 A184202 #7 Jul 22 2025 09:29:49 %S A184202 337,5529,80812,1232795,18588589,281420718,4255603649,64377477751, %T A184202 973770904216,14729764992131,222807558297931,3370276970276934, %U A184202 50980111666109221,771145138865934865,11664642166349200910 %N A184202 Number of (n+1)X5 binary arrays with no 2X2 subblock containing fewer than two 1s. %C A184202 Column 4 of A184207 %H A184202 R. H. Hardin, <a href="/A184202/b184202.txt">Table of n, a(n) for n = 1..200</a> %F A184202 Empirical: a(n)=14*a(n-1)+49*a(n-2)-472*a(n-3)-488*a(n-4)+4808*a(n-5)+278*a(n-6)-15914*a(n-7)+2888*a(n-8)+23043*a(n-9)-5467*a(n-10)-16111*a(n-11)+3566*a(n-12)+5580*a(n-13)-915*a(n-14)-951*a(n-15)+91*a(n-16)+73*a(n-17)-3*a(n-18)-2*a(n-19) %e A184202 Some solutions for 3X5 %e A184202 ..1..0..1..1..1....0..1..0..1..0....1..1..0..1..1....0..1..1..0..1 %e A184202 ..1..1..0..1..1....1..1..1..0..1....1..1..0..1..1....1..1..0..1..0 %e A184202 ..0..1..0..1..0....0..1..1..0..1....0..1..1..1..0....1..0..1..1..1 %K A184202 nonn %O A184202 1,1 %A A184202 _R. H. Hardin_ Jan 10 2011