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