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A146420 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation. 0

%I

%S 1,1,1,1,5,13,29,109,438,2055,12862,88991,791639,8191225,106776687,

%T 1583975637,29823226111,639792465701

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.1.1.1.0.0

%e .0.1.0.0.1.0.0.0

%e .0.1.0.0.1.0.0.0

%e .1.1.1.0.1.0.0.0

%e .0.0.0.1.0.1.1.1

%e .0.0.0.1.0.0.1.0

%e .0.0.0.1.0.0.1.0

%e .0.0.1.1.1.0.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)