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A197460 Number of one-sided poly-[3.6.3.6]-tiles (holes allowed) with n cells (division into rhombi is significant). 2
1, 1, 4, 6, 19, 49, 143, 403, 1235, 3681, 11354, 34944, 108956, 340635, 1072593, 3388161, 10751029 (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. A197459, A197461.

Sequence in context: A064035 A010364 A110391 * A001683 A053892 A013126

Adjacent sequences:  A197457 A197458 A197459 * A197461 A197462 A197463

KEYWORD

hard,nonn

AUTHOR

Joseph Myers, Oct 15 2011

STATUS

approved

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Last modified April 26 11:11 EDT 2017. Contains 285444 sequences.