A075200 - OEIS

A075200

Number of polyominoes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).

1, 1, 2, 5, 9, 24, 41, 121, 212, 520, 773, 2577, 3037, 8081, 13954, 32124, 41695, 118784, 150188, 411484, 604304, 1305265, 1954823, 5326890, 7331606

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OFFSET

1,3

REFERENCES

Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

LINKS

CROSSREFS

KEYWORD

hard,nonn

AUTHOR

Joseph Myers, Sep 08 2002

EXTENSIONS

More terms from Joseph Myers, Nov 04 2003

a(24) and a(25) from Joseph Myers, Nov 17 2010

STATUS

approved