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 A069405 #13 Aug 19 2024 17:13:20 %S A069405 15,285,4541,66579,944157,13182673,182702967,2522968803,34777826197, %T A069405 478971480223,6593672923115,90751017499077,1248904863846397, %U A069405 17186379018703213,236498372271010941,3254365880309197587,44781833050605593997,616220311429717310963 %N A069405 Half the number of n X 5 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row. %H A069405 Sean A. Irvine, <a href="/A069405/b069405.txt">Table of n, a(n) for n = 1..250</a> %Y A069405 Cf. 1 X n A000225, 2 X n A016269, 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 A069405 nonn %O A069405 1,1 %A A069405 _R. H. Hardin_, Mar 22 2002 %E A069405 More terms from _Sean A. Irvine_, Aug 19 2024