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 A180755 #5 Jul 22 2025 08:28:34 %S A180755 0,5,7,70,410,2986,20205,141313,986376,6925085,48597819,341209889, %T A180755 2395331138,16816717757,118065063145,828920971395,5819799452720, %U A180755 40860590480721,286880736650848,2014179680712444,14141486042579555 %N A180755 Half the number of nX6 binary arrays with each element equal to at least two neighbors. %C A180755 Column 6 of A180760 %H A180755 R. H. Hardin, <a href="/A180755/b180755.txt">Table of n, a(n) for n=1..199</a> %K A180755 nonn %O A180755 1,2 %A A180755 _R. H. Hardin_ Sep 20 2010