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

1,2

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.

Links

Table of n, a(n) for n=1..14.

Crossrefs

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

Sequence in context: A302185 A150432 A150433 * A325581 A162044 A150434

Adjacent sequences: A197551 A197552 A197553 * A197555 A197556 A197557

Keyword

hard,nonn

Author

Joseph Myers, Oct 16 2011

Status

approved