login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

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

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,3,9,19,33,77,255,1039,4359,18069,81085,437915,2749579,

%T 20046895,155332489,1345844489,12832415197,142867250585

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

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.0.0.1.0.0.1

%e .0.1.0.0.0.1.1.1

%e .1.1.1.0.0.0.1.0

%e .1.0.0.1.0.0.1.0

%e .0.0.0.1.1.1.0.0

%e .0.0.1.1.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_