%I A050257
%S A050257 0,0,0,299710
%N A050257 Number of distinct antimagic squares of order n (modulo rotations and 
               reflections).
%C A050257 An Anti-Magic Square (AMS) is an arrangement of the numbers 1 to n*n 
               in a square matrix such that the row, column and diagonal sums form 
               a sequence of consecutive integers.
%H A050257 J. Cormie, <a href="http://www.uwinnipeg.ca/~vlinek/jcormie/index.html">
               The Anti-Magic Square Project</a>
%H A050257 J. Cormie, <a href="a050257.gif">Example</a>: sorting the sums (numbers 
               in black on the border) yields the sequence: 252, 253, 254, 255, 
               256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 
               269 (from web page above).
%H A050257 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               AntimagicSquare.html">Link to a section of The World of Mathematics.</
               a>
%H A050257 <a href="Sindx_Mag.html#magic">Index entries for sequences related to 
               magic squares</a>
%Y A050257 Sequence in context: A048906 A119740 A022246 this_sequence A113939 A023686 
               A156998
%Y A050257 Adjacent sequences: A050254 A050255 A050256 this_sequence A050258 A050259 
               A050260
%K A050257 nonn,hard,bref,nice
%O A050257 1,4
%A A050257 Eric Weisstein (eric(AT)weisstein.com)
%E A050257 a(n) not known for n >=5.