A197958 Number of free poly-IH4-tiles (holes allowed) with n cells.

1, 5, 11, 52, 186, 848, 3652, 16843, 77359, 363387, 1716033, 8185607, 39267086, 189509099

Offset

1,2

Comments

Equivalently, one-sided poly-IH13-tiles or one-sided poly-IH15-tiles. IH4 is the generic isohedral tiling by 180-degree rotation (Conway criterion).

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. A197959, A197960.

Sequence in context: A149526 A249075 A089004 * A094107 A107009 A228865

Adjacent sequences: A197955 A197956 A197957 * A197959 A197960 A197961

Keyword

hard,nonn

Author

Joseph Myers, Oct 19 2011

Status

approved