Search: id:A144554
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%I A144554
%S A144554 1,1,1,3,3,7,8,25,25,82,85,302,307,1111,1131,4216,4267,16076,16253,
%T A144554 61976,62475,239927,241447,933576,937574,3644073,3653624
%N A144554 Number of polyominoes with n cells whose symmetry group (excluding reflections) 
               has order at least 2.
%D A144554 D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete 
               Math., 36 (1981), 191-203.
%H A144554 Tomas Oliveira e Silva, <a href="http://www.ieeta.pt/~tos/animals.html">
               Enumeration of polyominoes</a>
%H A144554 D. H. Redelmeier, <a href="a056877.png">Table 3</a> of Counting polyominoes...
%F A144554 This is the sum of A142886, A056877, A144553, A056878 and A006747. - 
               Joseph Myers, Dec 31 2008.
%Y A144554 Sequences classifying polyominoes by symmetry group: A000105, A006746, 
               A006747, A006748, A006749, A056877, A056878, A142886, A144553, A144554.
%Y A144554 Sequence in context: A108046 A116157 A056357 this_sequence A143088 A131036 
               A034411
%Y A144554 Adjacent sequences: A144551 A144552 A144553 this_sequence A144555 A144556 
               A144557
%K A144554 nonn,more
%O A144554 1,4
%A A144554 Frederick Schneider (frederick.william.schneider(AT)gmail.com), Dec 28 
               2008
%E A144554 Edited by N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2009
%E A144554 17 additional terms (just summing the terms from the 5 sequences specified 
               in the description) Fred Schneider (frederick.william.schneider(AT)gmail.com), 
               Jan 03 2009

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