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 A069427 #9 Apr 07 2021 18:55:27 %S A069427 1,2059,509019,77892523,9681281781 %N A069427 Number of n X 7 binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row. %Y A069427 Cf. 2 X n A001047, n X 2 A034182, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452. %K A069427 nonn %O A069427 1,2 %A A069427 _R. H. Hardin_, Mar 22 2002