

A142886


Number of polyominoes with n cells that have the symmetry group D_8.


10



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
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OFFSET

0,10


COMMENTS

This is the largest possible symmetry group that a polyomino can have.


REFERENCES

D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete Math., 36 (1981), 191203.


LINKS

Table of n, a(n) for n=0..27.
Tomas Oliveira e Silva, Enumeration of polyominoes
D. H. Redelmeier, Table 3 of Counting polyominoes...


CROSSREFS

Sequences classifying polyominoes by symmetry group: A000105, A006746, A006747, A006748, A006749, A056877, A056878, A142886, A144553, A144554.
Sequence in context: A224777 A225853 A143161 * A099026 A205341 A195664
Adjacent sequences: A142883 A142884 A142885 * A142887 A142888 A142889


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Jan 01 2009


STATUS

approved



