A146192 - OEIS

A146192

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-100 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,5,13,25,47,133,423,1611,6775,32933,168271,931101,

%T 5598003,40830563,323824599,3032262553,30578017195,362047227023

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.0.1.0.0

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.0.1.1

%e .1.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.1

%e .1.1.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.0.1.0.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Oct 27 2008