A212416 Number of free poly-IH7-tiles (holes allowed) with n cells.

1, 3, 13, 44, 186, 820, 3652, 16689, 77383, 362671, 1716033, 8182315, 39267086, 189492795

Offset

1,2

Comments

Equivalently, one-sided poly-IH16-tiles.

References

Branko Gruenbaum 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. A213951.

Sequence in context: A058407 A095863 A136520 * A058934 A141088 A187915

Adjacent sequences: A212413 A212414 A212415 * A212417 A212418 A212419

Keyword

hard,more,nonn

Author

Joseph Myers, Jun 26 2012

Status

approved