A197550 Number of free poly-IH8-tiles (holes allowed) with n cells.

1, 3, 7, 28, 99, 433, 1852, 8463, 38798, 181889, 858570, 4093739, 19636172, 94759074

Offset: 1

Author

Joseph Myers, Oct 16 2011

Keywords

• hard
• nonn
• more

Comments

Equivalently, one-sided polybricks, or polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a rotation of order 2.

References

• Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.

Links

• Tom McLean, IH8.

Crossrefs

Cf. A000228, A001207, A006535, A057973, A197549, A197551, A197552, A197553, A197554.