Search: id:A129553
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%I A129553
%S A129553 0,0,0,0,0,0,0,8,44,528,5976,77896,1052884,13666360
%N A129553 Number of ways to place n+3 queens and 3 pawns on an n X n board so that 
               no two queens attack each other.
%H A129553 R. D. Chatham, <a href="http://people.moreheadstate.edu/fs/d.chatham/
               n+kqueens.html">The N+k Queens Problem Page</a>.
%H A129553 R. D. Chatham, M. Doyle, G. H. Fricke, J. Reitmann, R. D. Skaggs and 
               M. Wolff, <a href="http://people.moreheadstate.edu/fs/d.chatham/QueensSep2.pdf">
               Independence and Domination Separation in Chessboard Graphs</a>, 
               Journal of Combinatorial Mathematics and Combinatorial Computing, 
               to appear.
%e A129553 a(4)=0 because when 7 queens are placed on a 4 X 4 board, at least two 
               queens will be adjacent and therefore mutually attacking.
%Y A129553 Cf. A000170, A129554.
%Y A129553 Sequence in context: A112908 A001689 A028565 this_sequence A075863 A118838 
               A153828
%Y A129553 Adjacent sequences: A129550 A129551 A129552 this_sequence A129554 A129555 
               A129556
%K A129553 more,nonn
%O A129553 1,8
%A A129553 R. Douglas Chatham (d.chatham(AT)moreheadstate.edu), Apr 20 2007

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