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 A069331 #11 Apr 27 2024 18:07:41 %S A069331 1,1681,1332456,804230945,424660442975,207204257344200, %T A069331 95972872569551099,42856467943438387389,18633578769242938930634, %U A069331 7941841818960714166446386,3334133239588212397398261473,1383615906056315517856514817504,569069897400777230243560762294416 %N A069331 Number of 9 X n binary arrays with path of adjacent 1's from upper right corner to lower left corner. %Y A069331 Cf. 2 X n A048739, 3 X n A069325, 4 X n A069326, 5 X n A069327, 6 X n A069328, 7 X n A069329, 8 X n A069330, 10 X n A069332, 11 X n A069333, 12 X n A069334, 13 X n A069335, 14 X n A069336, 15 X n A069337, 16 X n A069338, 17 X n A069339, 18 X n A069340, 19 X n A069341, 20 X n A069342, n X n A069343, n X n symmetric A069344. %K A069331 nonn %O A069331 1,2 %A A069331 _R. H. Hardin_, Mar 16 2002 %E A069331 a(7)-a(13) from _Sean A. Irvine_, Apr 27 2024