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Number of n X n binary arrays with all ones connected only either as two by three or three by two blocks.
0

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

%S 1,1,5,13,47,375,3972,47068,892007,26215027,1025956370,55524872121,

%T 4474246357794,516153334755405,83220252331733856,19182699863712254411

%N Number of n X n binary arrays with all ones connected only either as two by three or three by two blocks.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.1.1.1.0.1.1.1

%e .0.1.1.1.0.1.1.1

%K nonn

%O 1,3

%A _R. H. Hardin_, Oct 27 2008