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 A239336 #6 Jun 02 2025 09:26:18 %S A239336 28,926,27341,790681,22952323,663249556,19117551262,550960518608, %T A239336 15873533676775,457181997376959,13166310184133045,379162593435951456, %U A239336 10918763117793096685,314422821700641922733,9054241291311457562833 %N A239336 Number of nX4 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it, modulo 4. %C A239336 Column 4 of A239340 %H A239336 R. H. Hardin, <a href="/A239336/b239336.txt">Table of n, a(n) for n = 1..210</a> %e A239336 Some solutions for n=3 %e A239336 ..2..1..1..0....2..0..0..1....0..0..0..0....2..2..0..0....2..2..2..1 %e A239336 ..0..3..2..0....0..2..1..3....2..1..1..2....0..2..1..1....0..3..3..2 %e A239336 ..2..0..0..2....3..2..1..2....3..2..1..0....0..0..2..2....0..2..2..0 %K A239336 nonn %O A239336 1,1 %A A239336 _R. H. Hardin_, Mar 16 2014