%I A146474
%S A146474 1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,85,85,375,375,2149,2149,15299,15299,
%T A146474 129877,129877,1353943,1353943,17475557,17475557
%N A146474 Number of n X n binary arrays symmetric about the diagonal and under 
               90 degree rotation with all ones connected only in a 1110-0111 pattern 
               in any orientation.
%e A146474 Maximal 11 X 11 example
%e A146474 .0.0.0.1.0.0.0.1.0.0.0
%e A146474 .0.0.0.1.1.0.1.1.0.0.0
%e A146474 .0.0.0.1.1.0.1.1.0.0.0
%e A146474 .1.1.1.0.1.0.1.0.1.1.1
%e A146474 .0.1.1.1.0.0.0.1.1.1.0
%e A146474 .0.0.0.0.0.0.0.0.0.0.0
%e A146474 .0.1.1.1.0.0.0.1.1.1.0
%e A146474 .1.1.1.0.1.0.1.0.1.1.1
%e A146474 .0.0.0.1.1.0.1.1.0.0.0
%e A146474 .0.0.0.1.1.0.1.1.0.0.0
%e A146474 .0.0.0.1.0.0.0.1.0.0.0
%Y A146474 Sequence in context: A146663 A146394 A147510 this_sequence A145957 A128019 
               A108411
%Y A146474 Adjacent sequences: A146471 A146472 A146473 this_sequence A146475 A146476 
               A146477
%K A146474 nonn
%O A146474 1,11
%A A146474 Ron Hardin (rhhardin(AT)att.net)