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 A240269 #6 Jun 02 2025 09:45:04 %S A240269 56,713,7562,126286,1363144,19210586,278945445,3200032085,46095401280, %T A240269 611757450541,7547496685660,107236644548985,1371266497746832, %U A240269 17737107517230511,244729672768718950,3116623507000444656 %N A240269 Number of nX5 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4. %C A240269 Column 5 of A240271 %H A240269 R. H. Hardin, <a href="/A240269/b240269.txt">Table of n, a(n) for n = 1..210</a> %e A240269 Some solutions for n=4 %e A240269 ..3..0..0..2..3....3..2..2..2..2....2..0..3..2..2....2..0..0..3..0 %e A240269 ..3..2..2..0..1....2..1..1..2..1....2..0..3..2..2....2..0..0..3..2 %e A240269 ..2..1..0..0..2....3..2..3..3..2....3..2..2..2..0....3..2..0..0..2 %e A240269 ..2..1..2..0..0....2..3..0..2..1....3..2..0..2..0....3..1..3..1..3 %K A240269 nonn %O A240269 1,1 %A A240269 _R. H. Hardin_, Apr 03 2014