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A147380 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,1,1,1,1,3,7,13,23,55,135,325,777,2227,6637,24107,84917,

%T 344887,1418553,6697895

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.0.0.0.0.0.1.0.0

%e .0.0.0.0.0.0.1.1.1.0.0

%e .0.0.0.0.1.1.1.0.0.1.1

%e .0.0.0.0.1.0.0.0.0.1.0

%e .0.0.1.1.0.0.0.0.1.1.0

%e .0.0.1.0.0.0.0.0.1.0.0

%e .0.1.1.0.0.0.0.1.1.0.0

%e .0.1.0.0.0.0.1.0.0.0.0

%e .1.1.0.0.1.1.1.0.0.0.0

%e .0.0.1.1.1.0.0.0.0.0.0

%e .0.0.1.0.0.0.0.0.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_

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Last modified August 17 17:59 EDT 2022. Contains 356189 sequences. (Running on oeis4.)