A146184 - OEIS

A146184

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.

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

%S 1,1,1,1,1,1,3,9,19,33,87,301,1337,5927,24359,118543,715115,5164241,

%T 42357883,353625469,3347092839,36905312969,482588953149,7069762004523,

%U 114903134718451

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.0.1.1.0.0.0

%e .0.1.1.0.0.1.1.1

%e .1.1.1.0.0.1.1.0

%e .0.0.0.1.1.0.1.0

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008