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%I #9 Jan 10 2019 05:58:14
%S 1,6,25,160,966,6018,37079,227357
%N Number of uncrossed unrooted knight's paths of length n on an infinite board.
%C Paths which are equivalent under rotation, reflection or reversal are counted only once.
%H Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a323132.htm">Illustrations of unrooted uncrossed knight's paths of length <= 4</a>, (2019).
%e See illustrations at Pfoertner link.
%Y Cf. A003192, A001334, A151541, A272773, A306178, A323131, A323133, A323134.
%K nonn,walk,more,hard
%O 1,2
%A _Hugo Pfoertner_, Jan 05 2019