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 A240282 #6 Jun 02 2025 09:46:24 %S A240282 4,181,2574,28654,484146,5646644,88953626,1357879302,17350066110, %T A240282 272318368893,3830297634073,53008989555669,804259922741153, %U A240282 11140838537971196,160309233474096916,2355215686029612116 %N A240282 Number of nX5 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4. %C A240282 Column 5 of A240284 %H A240282 R. H. Hardin, <a href="/A240282/b240282.txt">Table of n, a(n) for n = 1..210</a> %e A240282 Some solutions for n=4 %e A240282 ..3..1..3..1..3....3..1..3..1..3....3..1..3..1..3....3..1..3..3..1 %e A240282 ..2..0..0..2..2....2..0..0..0..2....2..0..0..1..3....3..1..2..0..0 %e A240282 ..2..0..2..0..2....2..0..2..2..0....2..0..2..3..1....2..2..2..2..0 %e A240282 ..3..1..0..0..2....2..0..0..2..2....2..0..0..0..2....3..3..2..0..0 %K A240282 nonn %O A240282 1,1 %A A240282 _R. H. Hardin_, Apr 03 2014