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A146059 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X3 U in any orientation. 0

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

%S 1,1,1,1,1,1,3,1,5,1,11,5,41,13,189,31,927,133,5603,759,45359,5033,

%T 469791,38887,5816617,382421,90000163,4832387,1751237935,75700651

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X3 U in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .0.1.1.0.0.0.1.1.0

%e .0.0.1.0.0.0.1.0.0

%e .0.1.1.0.0.0.1.1.0

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 26 2008

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)