%I A034921
%S A034921 3,4,9,23,67,192,833,2857,13797
%N A034921 Number of different determinants of n X n persymmetric matrices with 
               entries {-1,0,+1}.
%C A034921 A persymmetric (or Hankel) matrix has M[ i,j ] = M[ i-k,j+k ] for all 
               i and j (matrix is constant along antidiagonals).
%e A034921 For n = 1 and 2 the possible values for the determinant are {-1, 0, 1} 
               and {-2, -1, 0, 1}.
%Y A034921 Cf. A034917-A034920.
%Y A034921 Sequence in context: A049976 A032789 A089243 this_sequence A038222 A038629 
               A105229
%Y A034921 Adjacent sequences: A034918 A034919 A034920 this_sequence A034922 A034923 
               A034924
%K A034921 nonn,nice,more
%O A034921 1,1
%A A034921 Fred Lunnon (fred(AT)csa5.cs.may.ie)
%E A034921 More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 08 2006