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Number of non-equivalent ways to place n non-attacking ferses on an n X n board.
6

%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