Search: id:A030978
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%I A030978
%S A030978 1,4,5,8,13,18,25,32,41,50,61,72,85,98,113,128,145,162,181,200,221,242,
%T A030978 265,288,313,338,365,392,421,450,481,512,545,578,613,648,685,722,761,
%U A030978 800,841,882,925,968,1013,1058,1105,1152,1201,1250,1301,1352,1405,1458
%N A030978 Number of non-attacking knights on n X n board.
%D A030978 Dudeney, H. E. ``The Knight-Guards.'' #319 in Amusements in Mathematics; 
               New York: Dover, p. 95, 1970.
%D A030978 Madachy, J. S. Madachy's Mathematical Recreations; New York: Dover, pp. 
               38-39 1979.
%H A030978 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               KnightsProblem.html">Link to a section of The World of Mathematics.</
               a>
%F A030978 1/2 n^2 if n even > 2, 1/2 (n^2+1) if n odd > 1.
%Y A030978 Agrees with A000982 for n>1.
%Y A030978 Sequence in context: A011980 A061765 A133940 this_sequence A101948 A087475 
               A019526
%Y A030978 Adjacent sequences: A030975 A030976 A030977 this_sequence A030979 A030980 
               A030981
%K A030978 nonn,easy
%O A030978 0,2
%A A030978 Eric Weisstein (eric(AT)weisstein.com)
%E A030978 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).

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