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A197464
Number of fixed poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).
2
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.
CROSSREFS
Sequence in context: A162694 A230354 A349180 * A124205 A338259 A133403
KEYWORD
hard,nonn
AUTHOR
Joseph Myers, Oct 15 2011
EXTENSIONS
a(20)-a(26) from Aaron N. Siegel, Jun 03 2022
STATUS
approved