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A075202
Number of polyominoes with n cells that tile the plane by 180-degree rotation (Conway criterion).
10
1, 1, 2, 5, 12, 35, 101, 320, 960, 2701, 6164, 19770, 34918, 94023, 232714, 462463, 770010, 2462890, 3247171, 9756012, 18463420, 32963374, 51599559, 177923609, 236127160
OFFSET
1,3
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.
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