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 A180757 #5 Jul 22 2025 08:28:47 %S A180757 0,13,31,658,8840,141313,2141384,33329847,514990479,7988200496, %T A180757 123822198215,1920693558801,29793765165720,462205529321051, %U A180757 7170401050696078,111238701384104135,1725707750909016718 %N A180757 Half the number of nX8 binary arrays with each element equal to at least two neighbors. %C A180757 Column 8 of A180760 %H A180757 R. H. Hardin, <a href="/A180757/b180757.txt">Table of n, a(n) for n=1..99</a> %K A180757 nonn %O A180757 1,2 %A A180757 _R. H. Hardin_ Sep 20 2010