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A056878 Number of polyominoes with n cells, symmetric about diagonal 2. +0
12
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; listen)
OFFSET

1,11

REFERENCES

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

LINKS

Tomas 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.

Adjacent sequences: A056875 A056876 A056877 this_sequence A056879 A056880 A056881

Sequence in context: A036803 A018131 A121400 this_sequence A092557 A144680 A081493

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Sep 03 2000

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.


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