Search: id:A146590
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%I A146590
%S A146590 1,1,1,1,1,1,1,5,13,25,41,73,405,2087,9095,31781,109905,706437,6193961,
%T A146590 52066515,395176419,2801856537,27230658787
%N A146590 Number of n X n binary arrays symmetric about both diagonal and antidiagonal 
               with all ones connected only in a 0110-1111-0100 pattern in any orientation.
%e A146590 Maximal 8 X 8 example
%e A146590 .0.0.0.0.1.0.0.0
%e A146590 .0.0.1.1.1.1.0.0
%e A146590 .0.1.0.1.1.0.1.0
%e A146590 .0.1.1.0.0.1.1.1
%e A146590 .1.1.1.0.0.1.1.0
%e A146590 .0.1.0.1.1.0.1.0
%e A146590 .0.0.1.1.1.1.0.0
%e A146590 .0.0.0.1.0.0.0.0
%Y A146590 Sequence in context: A001844 A099776 A133322 this_sequence A098483 A147205 
               A146875
%Y A146590 Adjacent sequences: A146587 A146588 A146589 this_sequence A146591 A146592 
               A146593
%K A146590 nonn
%O A146590 1,8
%A A146590 Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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