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A056878
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Number of polyominoes with n cells, symmetric about diagonal 2.
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13
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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
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OFFSET
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1,11
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REFERENCES
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D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete Math., 36 (1981), 191-203.
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LINKS
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Table of n, a(n) for n=1..28.
Tomas Oliveira e Silva, Enumeration of polyominoes
D. H. Redelmeier, Table 3 of Counting polyominoes...
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CROSSREFS
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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: A018131 A121400 A218932 * A092557 A144680 A081493
Adjacent sequences: A056875 A056876 A056877 * A056879 A056880 A056881
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Sep 03 2000
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STATUS
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approved
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