A171090 Number of Apollonian packings of n circles that are Eulerian and irreducible.
1, 0, 1, 0, 2, 1, 5, 3, 18, 19, 79, 134, 501, 1147, 3976, 11055, 37231, 114560, 384053, 1244056, 4193857, 13977946, 47522279, 161222224, 553033544, 1899744032, 6571595339, 22793047258, 79449718217, 277760027418, 974836112457
Offset: 6
Keywords
Links
- G. Brinkmann, and B.D. McKay, Guide to using plantri (version 4.1).
- Gunnar Brinkmann and Brendan McKay, Guide to using plantri [Cached copy, with permission]
- S. Butler et al., Irreducible Apollonian configurations and packings, Discrete and Computational Geometry, 44 (2010), 487-507.
- CombOS - Combinatorial Object Server, Generate planar graphs
Extensions
More terms from plantri added by Sean A. Irvine, Jun 22 2016