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A146057 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X3 U in any orientation. 0

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

%S 1,1,1,1,5,13,31,133,759,5033,38887,382421,4832387,75700651,

%T 1478349269,35999240895,1090549247319,41238833131575,1952862897511921,

%U 115606424326327149,8526463138185345657,783968967361577289677

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X3 U in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.1.0.0.0

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .0.0.0.1.1.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.1.1.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 26 2008

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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)