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 A240416 #6 Jun 02 2025 09:56:24 %S A240416 57,529,10749,148536,1765436,33373526,425530595,5897838681, %T A240416 95307517175,1211349848865,18418502466795,271271920530483, %U A240416 3640504188151747,55380807100830022,781519568000794121,10995455837187187873 %N A240416 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 zero plus the sum of the elements diagonally to its northwest, modulo 4. %C A240416 Row 5 of A240412 %H A240416 R. H. Hardin, <a href="/A240416/b240416.txt">Table of n, a(n) for n = 1..210</a> %e A240416 Some solutions for n=4 %e A240416 ..2..3..2..2....2..3..3..2....2..3..3..2....2..3..3..2....2..3..3..2 %e A240416 ..2..3..2..1....1..3..1..0....2..1..2..0....1..3..2..0....2..1..1..1 %e A240416 ..2..0..0..3....3..0..2..2....2..3..0..0....1..0..3..2....2..0..0..1 %e A240416 ..1..0..3..2....1..0..0..2....2..3..0..2....3..2..0..3....1..0..0..2 %e A240416 ..2..0..1..2....1..0..0..0....2..1..0..0....3..2..2..2....2..3..3..1 %K A240416 nonn %O A240416 1,1 %A A240416 _R. H. Hardin_, Apr 04 2014