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 A241354 #5 Jun 02 2025 10:06:21 %S A241354 14,53,230,1721,6307,35880,183400,763750,4110488,18352240,83810292, %T A241354 417928329,1791097147,8714733830,40609374842,179584055937 %N A241354 Number of nX6 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 or zero plus the sum of the elements antidiagonally to its northeast, modulo 4. %C A241354 Column 6 of A241356 %e A241354 Some solutions for n=4 %e A241354 ..2..3..3..2..3..3....3..2..3..3..2..2....2..3..3..2..3..2....3..2..3..2..3..3 %e A241354 ..2..1..1..1..2..1....3..1..2..1..1..2....2..1..1..2..1..2....3..1..1..2..1..1 %e A241354 ..3..2..2..2..0..2....2..3..0..0..3..3....3..2..2..2..0..2....2..1..2..3..3..2 %e A241354 ..3..1..2..3..0..2....2..1..0..0..2..3....3..1..2..1..0..1....3..2..0..2..1..2 %K A241354 nonn %O A241354 1,1 %A A241354 _R. H. Hardin_, Apr 20 2014