|
| |
|
|
A144553
|
|
Number of polyominoes with n cells that have precisely the symmetry group of order 4 generated by 90 degree rotations.
|
|
10
|
|
|
|
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 2, 0, 0, 12, 7, 0, 0, 44, 25, 0, 0, 165, 90, 0, 0
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,12
|
|
|
REFERENCES
|
D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete Math., 36 (1981), 191-203.
|
|
|
LINKS
|
Table of n, a(n) for n=1..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: A160230 A059033 A133209 * A187130 A187145 A131290
Adjacent sequences: A144550 A144551 A144552 * A144554 A144555 A144556
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
N. J. A. Sloane, Jan 01 2009
|
|
|
STATUS
|
approved
|
| |
|
|
