A197464 Number of fixed poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).

12, 18, 36, 75, 168, 386, 888, 2079, 4960, 11988, 29280, 72145, 179112, 447636, 1124956, 2840097, 7197780, 18301738, 46669404, 119308938, 305704584, 784938678, 2019335340, 5204309886, 13435321764, 34738762062

Offset

1,1

References

Branko Gruenbaum 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..26.

Crossrefs

Cf. A197462, A197463.

Sequence in context: A162694 A230354 A349180 * A124205 A338259 A133403

Adjacent sequences: A197461 A197462 A197463 * A197465 A197466 A197467

Keyword

hard,nonn

Author

Joseph Myers, Oct 15 2011

Extensions

a(20)-a(26) from Aaron N. Siegel, Jun 03 2022

Status

approved