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 A189338 #7 Jul 22 2025 11:42:53 %S A189338 15,225,3375,36626,390721,3988168,42069350,442969881,4709354541, %T A189338 49857094654,528436125424,5591212296038,59196669906872, %U A189338 626540356943069,6633322246811551,70220475509151710,743409267344795743 %N A189338 Number of nX4 binary arrays without the pattern 1 0 0 1 diagonally, vertically, antidiagonally or horizontally. %C A189338 Column 4 of A189343 %H A189338 R. H. Hardin, <a href="/A189338/b189338.txt">Table of n, a(n) for n = 1..200</a> %e A189338 Some solutions for 5X4 %e A189338 ..0..0..0..1....0..0..0..1....0..0..1..0....0..0..0..1....0..0..0..1 %e A189338 ..1..0..1..0....0..0..1..0....0..0..1..0....0..1..1..0....0..0..0..0 %e A189338 ..1..0..0..0....0..0..1..1....0..1..0..1....0..0..1..0....0..0..0..1 %e A189338 ..0..0..1..0....0..1..0..0....1..0..1..0....1..1..1..0....0..1..1..0 %e A189338 ..0..0..0..0....1..1..0..0....1..1..0..1....1..1..0..0....0..0..0..0 %K A189338 nonn %O A189338 1,1 %A A189338 _R. H. Hardin_ Apr 20 2011