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A056877 Number of polyominoes with n cells, symmetric about axis 2. +0
8
0, 1, 1, 1, 1, 2, 3, 4, 4, 8, 10, 15, 17, 30, 35, 60, 64, 117, 128, 236, 241, 459, 476, 937, 912, 1813, 1789, 3706 (list; graph; listen)
OFFSET

1,6

REFERENCES

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

LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

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

Sequence in context: A028298 A047966 A097093 this_sequence A118263 A102539 A118022

Adjacent sequences: A056874 A056875 A056876 this_sequence A056878 A056879 A056880

KEYWORD

nonn

AUTHOR

njas, Sep 03 2000

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Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.


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