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%I #7 Jan 08 2018 18:34:22
%S 0,0,1,64,651,4680,56919,2578420,205224704
%N Number of chordless cycles in the n X n knight graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ChordlessCycle.html">Chordless Cycle</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/KnightGraph.html">Knight Graph</a>
%Y Cf. A001230, A234623.
%K nonn,more
%O 1,4
%A _Eric W. Weisstein_, Jan 02 2018
%E a(6)-a(9) from _Andrew Howroyd_, Jan 08 2018