%I #6 Dec 05 2016 05:09:16
%S 1,1,7,92,2102,66201,2651890,126928146,7060794663,447024321962
%N Number of non-equivalent ways to place n non-attacking ferses on an n X n board.
%C A fers is a leaper [1, 1].
%C Rotations and reflections of placements are not counted. If they are to be counted, see A201861.
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Fairy_chess_piece">Fairy chess piece</a>
%Y Cf. A201861, A278688.
%K nonn,more
%O 1,3
%A _Heinrich Ludwig_, Dec 02 2016