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

Offset: 1

Author

Joseph Myers, Oct 15 2011

Keywords

• nonn
• hard
• more

References

• Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.

Crossrefs

Cf. A197459, A197461.

Extensions

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