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 A208077 #7 Jun 07 2023 20:11:54 %S A208077 42,1764,30114,514089,10751415,224850025,4412968520,86610135616, %T A208077 1738407943480,34892708070025,694522498347405,13824134823318561, %U A208077 276034376753148762,5511735679904794404,109923500301084440190 %N A208077 Number of n X 7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 0 vertically. %C A208077 Column 7 of A208078. %H A208077 R. H. Hardin, <a href="/A208077/b208077.txt">Table of n, a(n) for n = 1..210</a> %e A208077 Some solutions for n=4 %e A208077 ..0..1..0..1..1..0..1....0..1..1..0..1..0..0....0..1..0..1..1..1..1 %e A208077 ..0..1..1..1..1..1..1....1..1..1..0..1..0..1....1..0..1..0..1..1..1 %e A208077 ..1..0..1..0..1..1..1....1..1..1..1..0..1..1....1..1..1..0..1..0..0 %e A208077 ..1..1..1..1..0..1..0....0..1..1..1..0..1..0....1..1..0..1..1..1..0 %Y A208077 Cf. A208078. %K A208077 nonn %O A208077 1,1 %A A208077 _R. H. Hardin_, Feb 23 2012