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A147182 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation. 0

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

%S 1,1,1,1,1,1,1,1,5,13,25,45,119,351,1205,4331,19073,79485,399897,

%T 2087281,12888453,83190775

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.1.0.1.0.0

%e .0.0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.1.1

%e .0.1.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.0.1.1

%e .0.1.0.0.0.0.1.1.0

%e .1.1.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0.0

%e .0.0.1.0.1.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)