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 A241360 #6 Jun 02 2025 10:06:46 %S A241360 10,5,72,248,615,6307,32942,81541,704210,3476469,11349940,90956040, %T A241360 405390982,1664167193,11617319555,51776391555,233086670659, %U A241360 1464941282986,6456205310547,31519467099790,186686429025271,825627186605085 %N A241360 Number of 5Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4. %C A241360 Row 5 of A241356 %H A241360 R. H. Hardin, <a href="/A241360/b241360.txt">Table of n, a(n) for n = 1..23</a> %e A241360 Some solutions for n=4 %e A241360 ..3..2..3..3....3..2..3..3....3..2..3..3....3..2..3..3....3..2..3..3 %e A241360 ..3..1..1..3....3..1..2..3....3..1..1..3....3..1..1..3....3..1..1..3 %e A241360 ..2..1..0..2....2..3..0..2....2..1..0..1....2..1..0..2....2..1..0..1 %e A241360 ..3..2..0..3....3..1..1..3....3..2..0..2....3..2..3..2....3..2..3..3 %e A241360 ..2..1..2..2....3..1..2..1....3..2..0..3....3..2..3..2....3..2..2..1 %K A241360 nonn %O A241360 1,1 %A A241360 _R. H. Hardin_, Apr 20 2014