%I A145242
%S A145242 1,3,51,813,75351,6514173,3287790591,1547899100553,4259466117807411,
%T A145242 10935733441872804453,164161963716080866194651
%N A145242 1/4 of the number of 4-colorings of an n X n array symmetric under 180 
               degree rotation.
%Y A145242 Sequence in context: A144987 A062216 A045489 this_sequence A075869 A126685 
               A105639
%Y A145242 Adjacent sequences: A145239 A145240 A145241 this_sequence A145243 A145244 
               A145245
%K A145242 nonn
%O A145242 1,2
%A A145242 Ron Hardin (rhhardin(AT)att.net), Oct 05 2008