A197463 Number of one-sided poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).

2, 3, 6, 13, 28, 66, 148, 349, 828, 2005, 4880, 12043, 29852, 74645, 187498, 473448, 1199630, 3050554, 7778234, 19885465, 50950796, 130824763, 336555890, 867389312, 2239220294, 5789804688

Offset: 1

Author

Joseph Myers, Oct 15 2011

Keywords

• hard
• nonn

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

Cf. A197462, A197464.

Extensions

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