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A146252 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-011 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:09

%S 1,1,3,1,5,5,15,23,69,89,411,639,3479,7047,38787,94093,630975,1734343,

%T 14199053,45390687,435447535,1674184531,18586794693,84450110411,

%U 1106569877013,5872912073625,91248958842685,569613725750709

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.1.1

%e .0.1.1.0.0.1.1.1

%e .0.1.1.1.0.1.1.0

%e .0.0.1.1.0.0.0.0

%e .0.0.0.0.1.1.0.0

%e .0.1.1.0.1.1.1.0

%e .1.1.1.0.0.1.1.0

%e .1.1.0.0.0.0.0.0

%K nonn

%O 1,3

%A _R. H. Hardin_

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Last modified April 19 12:06 EDT 2024. Contains 371792 sequences. (Running on oeis4.)