Search: id:A147087
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%I A147087
%S A147087 1,1,1,1,1,1,1,1,3,5,9,15,27,43,124,355,1029,2971,10017,31249,124044,
%T A147087 490643,2352059,10915093,60936189,323565841,2097402227
%N A147087 Number of n X n binary arrays symmetric about both diagonal and antidiagonal 
               with all ones connected only in a 10001-11111 pattern in any orientation.
%e A147087 Maximal 9 X 9 example
%e A147087 .0.0.1.0.0.0.1.0.0
%e A147087 .0.0.1.1.1.1.1.0.0
%e A147087 .1.1.0.0.0.0.0.1.1
%e A147087 .0.1.0.0.0.0.0.1.0
%e A147087 .0.1.0.0.0.0.0.1.0
%e A147087 .0.1.0.0.0.0.0.1.0
%e A147087 .1.1.0.0.0.0.0.1.1
%e A147087 .0.0.1.1.1.1.1.0.0
%e A147087 .0.0.1.0.0.0.1.0.0
%Y A147087 Sequence in context: A034084 A018342 A029485 this_sequence A140190 A083658 
               A018436
%Y A147087 Adjacent sequences: A147084 A147085 A147086 this_sequence A147088 A147089 
               A147090
%K A147087 nonn
%O A147087 1,9
%A A147087 Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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