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 A181243 #5 Jul 22 2025 08:38:43 %S A181243 256,28642,3507314,425288998,51630303190,6267120468434, %T A181243 760744103230314,92343922085798834,11209291140160525086, %U A181243 1360654834588676117974,165164912207734179639646,20048764401201147437094494 %N A181243 Number of nX8 binary matrices with no 2X2 circuit having pattern 0101 in any orientation. %C A181243 Column 8 of A181245 %H A181243 R. H. Hardin, <a href="/A181243/b181243.txt">Table of n, a(n) for n=1..200</a> %K A181243 nonn %O A181243 1,1 %A A181243 _R. H. Hardin_ Oct 10 2010