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%I #14 Jan 27 2019 18:59:19
%S 0,3,13,178,3031,64866
%N Number of polygons made of uncrossed knight's paths of length 2*n on an infinite board.
%H Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a323134.htm">Illustrations of uncrossed Knight's path polygons</a>, (2019).
%e See Pfoertner link.
%Y Cf. A003192, A157416, A258206, A266549, A284869, A316198.
%K nonn,hard,more
%O 1,2
%A _Hugo Pfoertner_, Jan 05 2019