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A146376 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0

%I

%S 1,1,1,1,1,5,13,31,121,491,3357,25639,206564,2153667,27375428,

%T 448457031,9212009681,222552225829,6521884144620,236096811899889,

%U 10628490855495893,594148587329565431,40503058557002692998,3359157855652125960413

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.0.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.0.0.1.0

%e .1.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.1

%e .0.1.0.0.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.0.1.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_

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Last modified October 21 11:42 EDT 2019. Contains 328296 sequences. (Running on oeis4.)