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 A069342 #10 Apr 28 2024 23:48:15 %S A069342 1,27304196,120418887728947,273114307102338469932, %T A069342 451242636516479543205804329,625576823311351623848371148927043, %U A069342 778880000189830517730349450554806038383,903099763914081099274411192869395521423076059,995759593882933848778575773902474323196918603122861 %N A069342 Number of 20 X n binary arrays with path of adjacent 1's from upper right corner to lower left corner. %Y A069342 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, 9 X n A069331, 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, n X n A069343, n X n symmetric A069344. %K A069342 nonn %O A069342 1,2 %A A069342 _R. H. Hardin_, Mar 16 2002 %E A069342 a(5)-a(9) from _Sean A. Irvine_, Apr 28 2024