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 A241395 #5 Jun 02 2025 10:07:22 %S A241395 8,44,201,1657,15339,160947,1622867,18627122,196990531,2356216195, %T A241395 25594964973,309860295135,3406115792732,41329346536802, %U A241395 457205784409075,5541954581513250,61567408955078580,744650178324042533 %N A241395 Number of nX5 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 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. %C A241395 Column 5 of A241397 %e A241395 Some solutions for n=4 %e A241395 ..3..2..2..2..3....2..3..3..3..2....3..2..3..3..2....2..3..2..2..2 %e A241395 ..1..2..1..1..3....2..1..1..1..0....1..2..1..1..2....2..1..2..0..0 %e A241395 ..3..2..3..1..2....2..3..2..2..2....3..0..2..2..2....3..0..2..2..0 %e A241395 ..3..2..2..2..2....2..3..2..0..0....3..0..0..1..2....3..2..0..3..2 %K A241395 nonn %O A241395 1,1 %A A241395 _R. H. Hardin_, Apr 20 2014