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 A180766 #5 Jul 22 2025 08:29:40 %S A180766 5,361,14621,606546,25448809,1064583557,44560487654,1865051797753, %T A180766 78060898850787,3267207111743056,136747572763258659, %U A180766 5723512289789881283,239555203487051506472,10026482454922619039947,419654213169799743389447 %N A180766 Half the number of nX6 binary arrays with each element equal to at least one neighbor. %C A180766 Column 6 of A180771 %H A180766 R. H. Hardin, <a href="/A180766/b180766.txt">Table of n, a(n) for n=1..199</a> %K A180766 nonn %O A180766 1,1 %A A180766 _R. H. Hardin_ Sep 20 2010