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Number of ways to place n nonattacking nightriders on an n X n board.
2

%I #9 Sep 12 2015 11:00:24

%S 1,6,36,412,4650,85358,1414678,32042312,710371744,20080400872,

%T 546562561108

%N Number of ways to place n nonattacking nightriders on an n X n board.

%C A nightrider is a fairy chess piece that can move any distance in a direction specified by a knight move.

%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>

%Y Cf. A196814, A190393.

%K nonn,hard

%O 1,2

%A _Vaclav Kotesovec_, Dec 22 2011