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 A240045 #9 Aug 24 2025 09:44:55 %S A240045 14,76,597,5780,55034,640643,8300260,119956268,1944727891,34311716212, %T A240045 646898229040 %N A240045 Number of n X 6 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4. %e A240045 Some solutions for n=3: %e A240045 ..2..3..2..2..3..3....2..3..2..2..2..2....3..2..2..2..2..2....2..3..3..3..2..2 %e A240045 ..1..0..0..3..1..2....1..0..0..0..0..3....2..1..1..1..0..3....3..1..2..0..0..3 %e A240045 ..1..0..0..0..2..2....1..2..0..0..1..3....2..1..1..2..1..0....2..1..0..0..1..2 %Y A240045 Column 6 of A240046. %K A240045 nonn,more %O A240045 1,1 %A A240045 _R. H. Hardin_, Mar 31 2014