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 A183370 #7 Jul 22 2025 08:52:40 %S A183370 1,4,6,16,30,64,165,361,875,2116,5460,13924,36720,97344,266895,727609, %T A183370 2029885,5654884,16014834,45265984,129279458,368947264,1060159545, %U A183370 3044280625,8779570735,25310900836,73171312896,211476737956,612259440564 %N A183370 Number of nX3 binary arrays with no element equal to the mod 3 sum of its diagonal and antidiagonal neighbors. %C A183370 Column 3 of A183374 %H A183370 R. H. Hardin, <a href="/A183370/b183370.txt">Table of n, a(n) for n = 1..200</a> %e A183370 Some solutions for 5X3 %e A183370 ..0..1..0....1..1..1....0..0..0....1..0..1....1..0..1....0..1..0....1..0..1 %e A183370 ..1..1..1....0..0..0....1..1..1....1..0..1....1..0..1....1..1..1....1..0..1 %e A183370 ..0..1..0....1..1..1....0..0..0....0..0..0....1..0..1....1..1..1....0..0..0 %e A183370 ..0..0..0....1..0..1....1..0..1....0..1..0....0..0..0....0..1..0....1..1..1 %e A183370 ..1..1..1....1..1..1....1..0..1....0..1..0....1..1..1....0..1..0....0..0..0 %K A183370 nonn %O A183370 1,2 %A A183370 _R. H. Hardin_ Jan 04 2011