%I A142886
%S A142886 1,1,0,0,1,1,0,0,1,2,0,0,3,2,0,0,5,4,0,0,12,7,0,0,20,11,0,0
%N A142886 Number of polyominoes with n cells that have the symmetry group D_8.
%C A142886 This is the largest possible symmetry group that a polyomino can have.
%D A142886 D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete 
               Math., 36 (1981), 191-203.
%H A142886 Tomas Oliveira e Silva, <a href="http://www.ieeta.pt/~tos/animals.html">
               Enumeration of polyominoes</a>
%H A142886 D. H. Redelmeier, <a href="a056877.png">Table 3</a> of Counting polyominoes...
%Y A142886 Sequences classifying polyominoes by symmetry group: A000105, A006746, 
               A006747, A006748, A006749, A056877, A056878, A142886, A144553, A144554.
%Y A142886 Sequence in context: A113411 A125095 A143161 this_sequence A099026 A053202 
               A050186
%Y A142886 Adjacent sequences: A142883 A142884 A142885 this_sequence A142887 A142888 
               A142889
%K A142886 nonn,more
%O A142886 0,10
%A A142886 N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2009