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 A069394 #9 Apr 07 2021 19:00:28 %S A069394 524287,273715645477,138901692341235797,67364511379527907595537 %N A069394 Number of n X 19 binary arrays with a path of adjacent 1's from top row to bottom row. %Y A069394 Cf. 1 X n A000225, 2 X n A005061, n X 2 A001333, 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 A069394 nonn %O A069394 1,1 %A A069394 _R. H. Hardin_, Mar 22 2002