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 A207860 #7 Jul 22 2025 20:54:06 %S A207860 16,256,1232,5929,44121,328329,2047902,12773476,85393582,570875449, %T A207860 3711466941,24129583569,158646920796,1043070030864,6826658594148, %U A207860 44678944061361,292963768764021,1920989217886281,12586269890069730 %N A207860 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically. %C A207860 Row 5 of A207858 %H A207860 R. H. Hardin, <a href="/A207860/b207860.txt">Table of n, a(n) for n = 1..210</a> %e A207860 Some solutions for n=4 %e A207860 ..1..1..0..0....1..1..0..1....1..0..1..1....1..0..1..1....0..0..1..1 %e A207860 ..0..0..1..1....1..0..0..1....1..1..0..0....1..0..1..1....1..1..0..0 %e A207860 ..0..0..1..1....0..0..1..1....1..1..0..0....0..1..1..1....1..1..0..0 %e A207860 ..0..0..1..1....0..1..1..0....0..1..1..1....0..1..1..0....1..0..0..1 %e A207860 ..0..1..1..0....1..1..0..0....0..1..1..1....1..1..0..0....0..0..1..1 %K A207860 nonn %O A207860 1,1 %A A207860 _R. H. Hardin_ Feb 21 2012