%I A018807
%S A018807 4,79,3600,281571,32572756,5109144543,1027533353168,254977173389319,
%T A018807 75925129079783308,26568150968269086211,10749154284380665611224
%N A018807 Number of ways to place n^2 nonattacking kings on 2n X 2n chessboard.
%Y A018807 Sequence in context: A048957 A006425 A065930 this_sequence A125710 A093854 
               A054322
%Y A018807 Adjacent sequences: A018804 A018805 A018806 this_sequence A018808 A018809 
               A018810
%K A018807 nonn,nice
%O A018807 1,1
%A A018807 David W. Wilson (davidwwilson(AT)comcast.net)