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 A240151 #5 Jun 02 2025 09:40:30 %S A240151 10,36,186,1328,11742,108201,1056699,10526838,107361960,1116331018, %T A240151 11525618748,120250941392,1248359598803,13042277879115, %U A240151 135683637852581,1417567382471017,14760989837426228 %N A240151 Number of nX5 0..3 arrays with no element equal to one 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 A240151 Column 5 of A240153 %e A240151 Some solutions for n=4 %e A240151 ..2..2..3..3..2....3..2..3..2..2....2..2..3..3..2....3..2..3..3..3 %e A240151 ..0..0..2..1..1....3..2..1..1..2....0..2..2..3..1....3..2..1..2..2 %e A240151 ..2..2..0..3..3....2..2..0..3..3....2..0..0..0..2....2..2..3..3..1 %e A240151 ..2..0..1..2..1....3..1..0..0..2....0..0..0..0..3....3..1..3..3..2 %K A240151 nonn %O A240151 1,1 %A A240151 _R. H. Hardin_, Apr 02 2014