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A146062 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X3 U in any orientation. 0

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

%S 1,1,1,5,13,37,193,825,4833,42541,409765,5652913,85462407,1745289105,

%T 41548085965,1274611587285,46878706682435,2328792987017875

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X3 U in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%e .0.0.0.0.0.0.0.0

%e .1.0.1.0.0.1.1.1

%e .1.1.1.0.0.1.0.1

%e .0.0.0.0.0.0.0.0

%e .1.0.1.0.0.1.0.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,4

%A _R. H. Hardin_, Oct 26 2008

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)