%I #3 Jan 17 2022 19:43:13
%S 1,6,132,20742,5834838,4198336824
%N Number of solutions to the Xqueens problem on an n X n board.
%H Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/Xqueens-and-Xqueenons.pdf">Xqueens and Xqueenons</a>, 2021.
%Y Cf. A350612-A350614.
%K nonn,more
%O 1,2
%A _Don Knuth_, Jan 16 2022
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