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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:14

%S 1,1,1,3,1,5,5,13,21,65,79,331,533,2619,5227,28001,61339,390903,

%T 1035837,7813633,23994329,210020947,748949341,7662897803,32193163805,

%U 385464587673,1890804496873,26436803024815,151320783550691

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.0.1.0

%e .0.1.1.1.0.1.1.1

%e .1.1.1.0.1.1.1.0

%e .0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0

%e .0.1.1.1.0.1.1.1

%e .1.1.1.0.1.1.1.0

%e .0.1.0.0.0.1.0.0

%K nonn

%O 1,4

%A _R. H. Hardin_, Nov 04 2008