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 A208368 #7 Jul 22 2025 21:18:04 %S A208368 42,1764,23010,275769,3759574,47178453,570085195,6982331490, %T A208368 85099853444,1028266559100,12425457898119,150136148402568, %U A208368 1811048511383583,21834166758810375,263223641419702766,3172338713859879000 %N A208368 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 0 vertically. %C A208368 Column 7 of A208369 %H A208368 R. H. Hardin, <a href="/A208368/b208368.txt">Table of n, a(n) for n = 1..210</a> %e A208368 Some solutions for n=4 %e A208368 ..1..1..1..1..0..1..0....1..0..1..0..1..1..0....0..1..1..1..1..0..1 %e A208368 ..1..0..1..1..0..1..0....1..1..0..1..1..0..0....1..1..0..1..0..1..0 %e A208368 ..1..1..0..1..0..1..0....0..1..1..1..1..1..0....1..1..1..1..1..1..0 %e A208368 ..0..1..0..1..0..1..0....1..1..1..1..0..1..0....1..0..1..1..1..0..0 %K A208368 nonn %O A208368 1,1 %A A208368 _R. H. Hardin_ Feb 25 2012