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 A069308 #11 Apr 26 2024 03:19:59 %S A069308 85,926,10269,114344,1275129,14226710,158755329,1771648672, %T A069308 19771329973,220646655318,2462407613981,27480393415984, %U A069308 306680449108553,3422545943800702,38195526542871473,426261120804626008 %N A069308 Number of 4 X n binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column. %H A069308 Sean A. Irvine, <a href="/A069308/b069308.txt">Table of n, a(n) for n = 2..200</a> %Y A069308 Cf. 2 X n A069306, 3 X n A069307, 5 X n A069309, 6 X n A069310, 7 X n A069311, 8 X n A069312, 9 X n A069313, 10 X n A069314, 11 X n A069315, 12 X n A069316, 13 X n A069317, 14 X n A069318, 15 X n A069319, 16 X n A069320, by columns A069294-A069305. %K A069308 nonn %O A069308 2,1 %A A069308 _R. H. Hardin_, Mar 14 2002