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A194496 Number of ways to arrange 6 nonattacking queens on the lower triangle of an n X n board. 1

%I

%S 0,0,0,0,0,0,0,0,64,1644,19306,146718,820218,3670288,13846830,

%T 45661556,134896662,364019248,909633276,2129318414,4709083054,

%U 9912162234,19970298696,38707229282,72458290216,131476840106,231906957348

%N Number of ways to arrange 6 nonattacking queens on the lower triangle of an n X n board.

%C Column 6 of A194498.

%H R. H. Hardin, <a href="/A194496/b194496.txt">Table of n, a(n) for n = 1..35</a>

%e Some solutions for 9 X 9:

%e 0 0 0 0

%e 0 1 0 0 1 0 0 0

%e 0 0 0 1 0 0 0 0 0 0 1 0

%e 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

%e 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0

%e 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0

%e 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0

%e 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1

%e 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0

%K nonn

%O 1,9

%A _R. H. Hardin_, Aug 26 2011

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)