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Counting sequence for classification of nonattacking queens on n X n toroidal board.
2

%I #5 Mar 31 2012 21:03:15

%S 1,1,1,2,1,2,3,5,1,3,23,30,40,4,132,218,5,1859,29517,1,2,9,18,51,470,

%T 7170,387830,1,6,1215,121487,89997968

%N Counting sequence for classification of nonattacking queens on n X n toroidal board.

%Y See comments and references for A054500.

%Y Cf. A054500, A054501, A053994, A007705, A006841.

%K nonn,nice,hard

%O 1,4

%A _Matthias Engelhardt_

%E More terms from _Matthias Engelhardt_, Jan 11 2001