%I A144057
%S A144057 1,2,1,3,5,13,23,83,158,743,1983,10973,39092,269179,1193276,10361962,
%T A144057 58314051,622131402,4633595266,60891994633,582192966557,9528749362116,
%U A144057 116024808662011,2351972316090989,37180717253935256,930816997530667262
%N A144057 Number of n X n binary arrays, symmetric about the diagonal and under 
               90 degree rotation, with every 1 adjacent to at least one other 1, 
               but at most one 1 adjacent horizontally and at most one 1 adjacent 
               vertically.
%Y A144057 Sequence in context: A092944 A049902 A096631 this_sequence A143581 A096871 
               A077890
%Y A144057 Adjacent sequences: A144054 A144055 A144056 this_sequence A144058 A144059 
               A144060
%K A144057 nonn
%O A144057 1,2
%A A144057 Ron Hardin (rhhardin(AT)att.net), Sep 08 2008