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A146154 Number of n X n binary arrays symmetric under horizontal and vertical reflection 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 1,1,1,1,3,1,10,10,43,65,310,319,2668,3017,34910,54223,689528,1137739,

%T 18655423,31210424,700220638,1365782613,38696080322,86209219516,

%U 3066770236798,7328473794260,340900040830525,897917903090606

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either as two by three or three by two blocks.

%e Maximal 8 X 8 example

%e .1.1.0.1.1.0.1.1

%e .1.1.0.1.1.0.1.1

%e .1.1.0.1.1.0.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.0.1.1.0.1.1

%e .1.1.0.1.1.0.1.1

%e .1.1.0.1.1.0.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 27 2008

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Last modified April 23 02:53 EDT 2024. Contains 371906 sequences. (Running on oeis4.)