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%I #3 Mar 31 2012 12:35:07
%S 1,3,45,597,42787,2695803,923529659,278451121903,457744547778601,
%T 663065487350675885
%N Number of n X n integer matrices, symmetric under 180 degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
%K nonn
%O 1,2
%A _R. H. Hardin_, Aug 06 2008
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