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A147288 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation. 0

%I

%S 1,1,1,1,5,13,29,101,617,3357,20865,140793,1290919,15614005,229745285,

%T 3898534669

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.1.1.1.0.0

%e .1.0.0.0.0.1.0.0

%e .1.1.1.0.0.1.1.0

%e .0.0.1.1.0.0.1.0

%e .0.1.0.0.1.1.0.0

%e .0.1.1.0.0.1.1.1

%e .0.0.1.0.0.0.0.1

%e .0.0.1.1.1.0.0.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008

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Last modified November 26 21:07 EST 2021. Contains 349344 sequences. (Running on oeis4.)