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 A163039 #6 Jul 22 2025 06:58:50 %S A163039 1,41,730,9362,104989,1111283,11457514,116648336,1180202569, %T A163039 11903604235,119872630650,1206201901904,12132446588769, %U A163039 122008622244019,1226843867304300,12335770043909076,124031577709569399 %N A163039 Number of nX4 binary arrays with all 1s connected and a path of 1s from left column to right column. %H A163039 R. H. Hardin, <a href="/A163039/b163039.txt">Table of n, a(n) for n=1..22</a> %K A163039 nonn %O A163039 1,2 %A A163039 _R. H. Hardin_ Jul 20 2009