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A141445 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. 0

%I

%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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Last modified July 23 11:44 EDT 2019. Contains 325254 sequences. (Running on oeis4.)