A146999 - OEIS

A146999

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,2,3,5,7,13,19,53,121,389,940,3064,7695,29728,97515,

%T 493327,1920641,10778992,46183271,290012194,1476840183,11445253811

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.1.0

%e .0.0.0.0.1.0.0.1

%e .1.0.0.0.1.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.1.0.0.0.1

%e .1.0.0.1.0.0.0.0

%e .0.1.1.1.1.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008