A197460 - OEIS

A197460

Number of one-sided poly-[3.6.3.6]-tiles (holes allowed) with n cells (division into rhombi is significant).

1, 1, 4, 6, 19, 49, 143, 403, 1235, 3681, 11354, 34944, 108956, 340635, 1072593, 3388161, 10751029, 34217608, 109255023, 349750874, 1122436127, 3610017340

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

REFERENCES

Branko Grünbaum 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..22.

CROSSREFS

Cf. A197459, A197461.

Sequence in context: A064035 A010364 A110391 * A001683 A053892 A013126

Adjacent sequences: A197457 A197458 A197459 * A197461 A197462 A197463

KEYWORD

nonn,hard,more

AUTHOR

Joseph Myers, Oct 15 2011

EXTENSIONS

a(18)-a(22) from Aaron N. Siegel, May 15 2022

STATUS

approved