A075206 Number of anisohedral polyominoes with n cells.

0, 0, 0, 0, 0, 0, 0, 1, 9, 44, 108, 222, 431, 900, 1157, 2258, 1381, 7429, 5542, 18306, 22067, 47849, 10542, 202169, 28977

Offset

1,9

Comments

A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.

References

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

Links

Table of n, a(n) for n=1..25.

Joseph Myers, Polyomino tiling

Crossrefs

Cf. A054359, A075198, A075199, A075200, A075201, A075202, A075203, A075204, A075205, A075215, A075224.

Sequence in context: A275793 A223647 A034194 * A161457 A162212 A161733

Adjacent sequences: A075203 A075204 A075205 * A075207 A075208 A075209

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