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A141507 Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 2 ones in any 2 X 2 subblock. 0

%I

%S 1,2,1,5,7,49,93,1237,4141,89949,498037,18459425,173151965,

%T 10776871089,170022693228,17856702680623,475042622997955,

%U 84045266807297263,3767160477564182682,1123350438602153100399,84860275331624989832681,42642871075536884664453747

%N Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 2 ones in any 2 X 2 subblock.

%K nonn

%O 0,2

%A _R. H. Hardin_, Aug 10 2008

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Last modified May 30 11:39 EDT 2020. Contains 334724 sequences. (Running on oeis4.)