A197554 Number of free poly-IH14-tiles (holes allowed) with n cells.

1, 2, 7, 24, 98, 415, 1846, 8378, 38764, 181482, 858387, 4091763, 19635210, 94749398

Offset: 1

Author

Joseph Myers, Oct 16 2011

Keywords

• hard
• nonn

Comments

Equivalently, polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a reflection or glide reflection in a line in one fixed direction parallel to the sides of the hexagons.

References

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

Crossrefs

Cf. A000228, A001207, A006535, A057973, A197549, A197550, A197551, A197552, A197553.