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%I #6 Mar 30 2012 18:35:34
%S 1,1,2,6,20,78,342,1608,7966,41054,218342,1191038,6635164,37621952,
%T 216557220,1262829914,7447921572
%N Number of 4n-step self-avoiding closed paths on first quadrant grid, passing through origin, symmetric about line y = x.
%Y Cf. A034010.
%K nonn
%O 0,3
%A _David W. Wilson_
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