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Number of ways to place 3 nonattacking nightriders on an n X n cylindrical board
3

%I #8 Sep 12 2015 11:00:27

%S 0,0,6,144,600,1992,4592,15616,31788,74840,122210,251184,384826,

%T 647696,1085190,1616384,2308872,3449880,4783326,7052400,9253734,

%U 12454640,16453096,22180992,28552450,36216544,46089162,58449104,72061346,91140000,109813780,135448576

%N Number of ways to place 3 nonattacking nightriders on an n X n cylindrical board

%C A nightrider is a fairy chess piece that can move (proportionate to how a knight moves) in any direction.

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

%H Vaclav Kotesovec, <a href="/A196811/a196811.txt">Generating function and explicit formula</a>

%Y Cf. A173429, A196813

%K nonn

%O 1,3

%A _Vaclav Kotesovec_, Oct 06 2011