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 A239985 #5 Jun 02 2025 09:36:16 %S A239985 1,8,107,4059,131242,4803152,226886115,9004871354,404795616742, %T A239985 19130966325023 %N A239985 Number of nX7 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4. %C A239985 Column 7 of A239986 %e A239985 Some solutions for n=3 %e A239985 ..3..0..0..0..0..0..0....3..0..0..0..0..0..0....3..0..0..0..0..0..0 %e A239985 ..3..1..3..0..0..0..0....2..3..0..0..3..3..0....2..3..0..0..3..3..0 %e A239985 ..3..2..2..1..3..0..0....2..0..0..3..3..3..1....2..0..0..3..0..3..3 %K A239985 nonn %O A239985 1,2 %A A239985 _R. H. Hardin_, Mar 30 2014