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 A240464 #6 Jun 02 2025 09:59:11 %S A240464 66,2200,75167,2632690,92193017,3228706651,113105814752,3962629938717, %T A240464 138830275066900,4863899993991019,170406516596392953, %U A240464 5970190697057475835,209165606073684385931,7328116621928639369238,256740568387799086329458 %N A240464 Number of 5Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4. %C A240464 Row 5 of A240460 %H A240464 R. H. Hardin, <a href="/A240464/b240464.txt">Table of n, a(n) for n = 1..210</a> %e A240464 Some solutions for n=3 %e A240464 ..0..0..0....2..2..2....0..0..2....2..0..2....0..2..0....0..2..0....2..0..0 %e A240464 ..0..2..2....0..0..0....0..2..2....0..0..0....0..2..0....0..2..1....0..0..2 %e A240464 ..2..0..0....2..0..2....2..0..0....0..0..2....2..0..0....0..0..2....0..0..2 %e A240464 ..0..0..0....2..0..2....0..0..2....0..2..0....3..1..0....0..2..0....0..2..0 %e A240464 ..2..0..0....0..2..2....0..3..2....0..0..0....3..1..2....2..0..1....2..0..1 %K A240464 nonn %O A240464 1,1 %A A240464 _R. H. Hardin_, Apr 05 2014