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%I #6 Oct 12 2013 15:25:23
%S 1,2,3,1,2,3,4,2,3,3,2,3,4,4,4,3,4,5,5,3,4,5,3,4,5,5,6,4,5,6,4,5,5,6,
%T 7,5,5,6,4,5,4,5,5,5,4,4,5,6,6,5,5,5,4,5,6,6,6,4,5,4,5,5,7,7
%N Arises in attempts to apply Engel's `probabilistic abacus' to random walks on infinite square grid.
%K nonn,walk
%O 1,2
%A _N. J. A. Sloane_, _James Propp_
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