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A212416 Number of free poly-IH7-tiles (holes allowed) with n cells 1
1, 3, 13, 44, 186, 820, 3652, 16689, 77383, 362671, 1716033, 8182315, 39267086, 189492795 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 24 07:14 EST 2020. Contains 338607 sequences. (Running on oeis4.)