Search: id:A130728
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%I A130728
%S A130728 1,2,2,6,3,27,28,324,338,5991,6875,228512,322056,17782554,30487207,
%T A130728 2704389848,5451449965,819155081866,1981437279113,497332226754331,
%U A130728 1457925225531230,603767469974886673,2133983730438871395
%N A130728 Number of ways of placing non-attacking knights on an n X n chessboard 
               symmetric under 90 degree rotation.
%Y A130728 Sequence in context: A081745 A129889 A130712 this_sequence A092384 A061915 
               A138565
%Y A130728 Adjacent sequences: A130725 A130726 A130727 this_sequence A130729 A130730 
               A130731
%K A130728 nonn
%O A130728 0,2
%A A130728 Ron Hardin (rhhardin(AT)att.net), Aug 25 2008

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