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 A302408 #8 Apr 15 2018 21:50:11 %S A302408 1,3,7,18,40,86,170,350,688,1394,2702,5338,10278,20078,38578,74820, %T A302408 143496,276890,530626,1020774,1955400,3754560,7190520,13790666, %U A302408 26407852,50612412,96911566,185660272,355485362,680860212,1303623528,2496462996 %N A302408 Number of n step self-avoiding walks on 3 X infinity grid starting from (0,0). %H A302408 Sean A. Irvine, <a href="/A302408/b302408.txt">Table of n, a(n) for n = 0..39</a> %Y A302408 Cf. A007825 (starting from (0,1)), A038577, A001411. %K A302408 nonn,walk %O A302408 0,2 %A A302408 _Sean A. Irvine_, Apr 07 2018