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 A180767 #5 Jul 22 2025 08:29:46 %S A180767 8,1172,89602,7053923,561487456,44560487654,3538520414645, %T A180767 280971809714842,22310318523546774,1771532822371947357, %U A180767 140667082973087038600,11169552997132511054788,886909077729036810872471 %N A180767 Half the number of nX7 binary arrays with each element equal to at least one neighbor. %C A180767 Column 7 of A180771 %H A180767 R. H. Hardin, <a href="/A180767/b180767.txt">Table of n, a(n) for n=1..99</a> %K A180767 nonn %O A180767 1,1 %A A180767 _R. H. Hardin_ Sep 20 2010