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 A163004 #8 Jan 13 2023 16:26:32 %S A163004 1,20,234,2423,24455,245972,2473317,24868730,250043151,2514035445, %T A163004 25277060955,254144975454,2555267942068,25691612225457, %U A163004 258313003017344,2597174783771339,26112958991681036,262549379235881855 %N A163004 Number of n X 4 binary arrays with all 1s connected and a path of 1s from upper left corner to lower right corner. %H A163004 R. H. Hardin, <a href="/A163004/b163004.txt">Table of n, a(n) for n=1..44</a> %Y A163004 Row 4 of A359573. %K A163004 nonn %O A163004 1,2 %A A163004 _R. H. Hardin_, Jul 20 2009