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 A207516 #7 Jul 22 2025 20:32:03 %S A207516 14,196,834,5458,29622,174224,991184,5723716,32841502,188945636, %T A207516 1085703774,6241589274,35874036584,206212212976,1185324296910, %U A207516 6813497962604,39164988487700,225125708916362,1294048535709874 %N A207516 Number of nX5 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically. %C A207516 Column 5 of A207519 %H A207516 R. H. Hardin, <a href="/A207516/b207516.txt">Table of n, a(n) for n = 1..210</a> %e A207516 Some solutions for n=4 %e A207516 ..1..0..0..0..0....0..1..1..1..1....1..0..1..1..1....0..1..1..1..0 %e A207516 ..1..0..1..1..0....1..1..0..1..1....0..0..0..0..0....0..0..0..0..0 %e A207516 ..1..0..1..1..0....1..0..0..0..0....0..0..0..0..0....0..0..0..0..0 %e A207516 ..0..1..1..1..1....0..0..0..0..0....1..0..0..0..0....0..1..1..1..0 %K A207516 nonn %O A207516 1,1 %A A207516 _R. H. Hardin_ Feb 18 2012