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 A239337 #6 Jun 02 2025 09:26:24 %S A239337 66,5078,346028,22952323,1527488498,101276030555,6693244281896, %T A239337 442014330398515,29178369838713161,1925440562309496640, %U A239337 127035121924736497404,8380770923086769177166,552870412078787577689020 %N A239337 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, modulo 4. %C A239337 Column 5 of A239340 %H A239337 R. H. Hardin, <a href="/A239337/b239337.txt">Table of n, a(n) for n = 1..210</a> %e A239337 Some solutions for n=2 %e A239337 ..0..2..0..0..1....2..0..1..1..2....2..0..2..2..1....0..2..1..1..0 %e A239337 ..2..0..0..2..3....2..0..1..1..3....0..2..2..0..2....2..0..2..3..1 %K A239337 nonn %O A239337 1,1 %A A239337 _R. H. Hardin_, Mar 16 2014