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A146004 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2. 0

%I #3 Mar 31 2012 12:35:08

%S 1,1,2,1,4,7,21,46,195,635,3736,16722,140702,874897,10218521,89150959,

%T 1456627028,17686096248,403908679949,6882785245717,219237062845023,

%U 5210440958351021,232082441606979544,7714095184686817142

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.0.1.1.1

%e .0.0.1.0.0.0.1.0

%e .0.1.1.1.0.1.0.0

%e .0.0.1.0.1.1.1.0

%e .0.1.0.0.0.1.0.0

%e .1.1.1.0.0.0.0.0

%e .0.1.0.0.0.0.0.0

%K nonn

%O 1,3

%A _R. H. Hardin_, Oct 26 2008

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Last modified April 18 15:16 EDT 2024. Contains 371780 sequences. (Running on oeis4.)