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A146017 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation. 0

%I

%S 1,1,1,1,1,1,1,1,29,29,297,297,3639,3639,84611,84611,2861167,2861167,

%T 210769267,210769267,22904472355,22904472355

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.

%e Maximal 9 X 9 example

%e .1.0.1.1.0.1.1.0.1

%e .1.0.0.1.0.1.0.0.1

%e .1.0.0.1.0.1.0.0.1

%e .1.1.0.1.0.1.0.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.0.1.0.1.0.1.1

%e .1.0.0.1.0.1.0.0.1

%e .1.0.0.1.0.1.0.0.1

%e .1.0.1.1.0.1.1.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Oct 26 2008

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Last modified October 24 11:34 EDT 2021. Contains 348225 sequences. (Running on oeis4.)