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A147509 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,3,5,9,15,23,53,159,467,1455,4183,13257,47381,210539,

%T 963601,4871497,24721415,137844971,829467103,5811222331

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.1.0

%e .0.0.1.1.1.1.0.1

%e .0.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.0

%e .1.0.1.1.1.1.0.0

%e .0.1.1.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_

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Last modified April 24 06:34 EDT 2024. Contains 371920 sequences. (Running on oeis4.)