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A147197 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,5,5,9,17,69,103,261,509,2919,6029,27429,73047,523687,

%T 1587321,10285447,37481773,334798483,1395159927,13476048417,

%U 66683704581,829426776361

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.0.1.0.0.1.1.0

%e .0.1.1.0.0.1.0.0

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008

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Last modified September 19 18:07 EDT 2024. Contains 376014 sequences. (Running on oeis4.)