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A197459 Number of free poly-[3.6.3.6]-tiles (holes allowed) with n cells (division into rhombi is significant). 2
1, 1, 3, 4, 12, 27, 78, 208, 635, 1859, 5726, 17526, 54620, 170479, 536714, 1694567, 5376764 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Cf. A197460, A197461.

Sequence in context: A264484 A000942 A255436 * A000207 A002986 A147569

Adjacent sequences:  A197456 A197457 A197458 * A197460 A197461 A197462

KEYWORD

hard,nonn

AUTHOR

Joseph Myers, Oct 15 2011

STATUS

approved

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Last modified July 22 23:05 EDT 2017. Contains 289676 sequences.