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 A240459 #6 Jun 02 2025 09:58:43 %S A240459 32,1583,65723,2501883,92193017,3337483054,119643524281,4265146133201, %T A240459 151546630250473,5374173813805185,190357922342008547, %U A240459 6737907461668482163,238393662801305197196,8432427442592587713280,298224063492597274075079 %N A240459 Number of nX5 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4. %C A240459 Column 5 of A240460 %H A240459 R. H. Hardin, <a href="/A240459/b240459.txt">Table of n, a(n) for n = 1..181</a> %e A240459 Some solutions for n=3 %e A240459 ..2..2..2..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..2..0 %e A240459 ..0..2..0..0..0....2..2..0..0..2....2..0..2..2..0....0..0..0..0..0 %e A240459 ..0..0..2..0..0....2..2..2..2..0....0..0..0..0..0....2..2..2..0..2 %K A240459 nonn %O A240459 1,1 %A A240459 _R. H. Hardin_, Apr 05 2014