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A146044 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation. 0

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

%S 1,1,1,1,1,7,15,37,79,277,1211,6171,28503,152765,945077,7764777,

%T 66517839,667569119,7061433273,91063498499,1300158727279,

%U 22513920414055

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.0.0

%e .0.0.0.0.1.1.0.0

%e .1.1.1.1.0.1.0.0

%e .0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0

%e .0.0.1.0.1.1.1.1

%e .0.0.1.1.0.0.0.0

%e .0.0.1.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Oct 26 2008

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Last modified March 28 14:02 EDT 2024. Contains 371254 sequences. (Running on oeis4.)