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 A207743 #7 Jul 22 2025 20:45:39 %S A207743 14,196,1414,10201,86355,731025,5959350,48580900,400851670,3307515121, %T A207743 27172739769,223236405441,1837212857466,15120074510116, %U A207743 124343788256622,1022572849602249,8412135030604107,69201930992634801,569203250129458902 %N A207743 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 0 vertically. %C A207743 Row 5 of A207741 %H A207743 R. H. Hardin, <a href="/A207743/b207743.txt">Table of n, a(n) for n = 1..210</a> %e A207743 Some solutions for n=4 %e A207743 ..0..1..1..0....0..0..1..1....0..1..1..0....1..1..0..0....0..1..1..1 %e A207743 ..1..1..0..1....1..0..1..1....0..1..1..1....0..0..1..1....1..0..1..1 %e A207743 ..0..0..1..1....1..0..0..1....0..0..1..1....1..1..1..1....1..1..1..1 %e A207743 ..1..1..1..0....1..0..1..1....0..1..1..0....0..0..1..1....0..1..1..0 %e A207743 ..0..1..1..1....1..0..1..1....0..0..1..1....1..1..0..0....1..1..0..1 %K A207743 nonn %O A207743 1,1 %A A207743 _R. H. Hardin_ Feb 19 2012