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A171090
Number of Apollonian packings of n circles that are Eulerian and irreducible.
1
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
6,5
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
CROSSREFS
Sequence in context: A194809 A113178 A108362 * A141506 A345454 A271684
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 08 2010
EXTENSIONS
More terms from plantri added by Sean A. Irvine, Jun 22 2016
STATUS
approved