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 A207471 #7 Jun 16 2023 15:27:17 %S A207471 42,1764,12994,101233,644401,3205650,16675001,76629370,345252578, %T A207471 1534975920,6569471819,28198798691,119211939368,501052508853, %U A207471 2103730122314,8781162264514,36654035342450,152721010610871 %N A207471 Number of 7 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically. %C A207471 Row 7 of A207467. %H A207471 R. H. Hardin, <a href="/A207471/b207471.txt">Table of n, a(n) for n = 1..210</a> %e A207471 Some solutions for n=4 %e A207471 ..0..0..1..0....0..1..0..1....1..0..1..0....1..0..0..1....1..0..1..0 %e A207471 ..1..0..1..0....0..0..1..0....1..1..0..1....0..1..0..0....1..1..1..0 %e A207471 ..1..0..1..0....0..0..1..0....1..1..0..1....0..1..0..0....1..1..1..1 %e A207471 ..0..1..0..1....1..0..0..1....0..1..0..0....1..1..1..1....0..1..0..1 %e A207471 ..0..1..0..1....1..0..0..1....0..0..1..0....1..1..1..1....0..1..0..1 %e A207471 ..1..0..0..1....1..0..1..0....0..0..1..0....0..0..1..0....1..1..1..1 %e A207471 ..1..0..1..0....1..0..1..0....0..0..1..0....0..0..1..0....1..0..1..0 %Y A207471 Cf. A207467. %K A207471 nonn %O A207471 1,1 %A A207471 _R. H. Hardin_, Feb 18 2012