%I A052153
%S A052153 1,9,26,60,111
%N A052153 Rhombi (in 3 different orientations) in a rhombus with 60 degree acute 
               angles.
%H A052153 Dr. Math, <a href="http://mathforum.org/dr.math/problems/arrty25.html">
               Source, about 2/3rds down. Message dated 01/18/2000.</a>
%Y A052153 Cf. A000330, A000537, A006003.
%Y A052153 Sequence in context: A085367 A081267 A154560 this_sequence A048468 A048771 
               A055849
%Y A052153 Adjacent sequences: A052150 A052151 A052152 this_sequence A052154 A052155 
               A052156
%K A052153 nonn
%O A052153 1,2
%A A052153 Tom Gray (TGray9278(AT)aol.com), Jan 24 2000
%E A052153 Better description from Larry Reeves (larryr(AT)acm.org), Mar 21 2001