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A146151 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation. 0

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,3,9,27,119,633,3943,30791,332473,4676705,79725173,1817184081,

%T 50545874411,1811092006865

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.0.1.1.0

%e .1.1.0.0.0.0.1.1

%e .1.0.0.1.0.0.0.1

%e .0.0.1.1.0.1.1.0

%e .0.1.1.0.1.1.0.0

%e .1.0.0.0.1.0.0.1

%e .1.1.0.0.0.0.1.1

%e .0.1.1.0.0.1.1.0

%K nonn

%O 1,4

%A _R. H. Hardin_, Oct 27 2008

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)