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A056878 Number of polyominoes with n cells, symmetric about diagonal 2. 13
0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 3, 3, 5, 6, 14, 9, 20, 20, 56, 32, 80, 64, 224, 114, 315, 217, 863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

REFERENCES

D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete Math., 36 (1981), 191-203.

LINKS

Table of n, a(n) for n=1..28.

Tomás Oliveira e Silva, Enumeration of polyominoes

D. H. Redelmeier, Table 3 of Counting polyominoes...

CROSSREFS

Cf. A000105, A001168, A006746, A056877, A006748, A056878, A006747, A006749.

Sequences classifying polyominoes by symmetry group: A000105, A006746, A006747, A006748, A006749, A056877, A056878, A142886, A144553, A144554.

Sequence in context: A121400 A238003 A218932 * A092557 A144680 A081493

Adjacent sequences:  A056875 A056876 A056877 * A056879 A056880 A056881

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 03 2000

STATUS

approved

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Last modified February 7 01:02 EST 2016. Contains 268050 sequences.