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A176709
Number of isomorphism classes of 6-fold coverings of a connected graph with Betti number n.
1
1, 11, 901, 524137, 373486525, 268749463729, 193492277719861, 139314094050615817, 100306131218514392365, 72220413687258533050849, 51998697816934668649790821, 37439062426374732606941352697, 26956124946902542404909380816605, 19408409961765641983297475951692369
OFFSET
0,2
REFERENCES
J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161.
LINKS
M. W. Hero and J. F. Willenbring, Stable Hilbert series as related to the measurement of quantum entanglement, Discrete Math., 309 (2010), 6508-6514.
CROSSREFS
Row 6 of A160449.
Sequence in context: A162448 A024150 A052071 * A336800 A083816 A233092
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 07 2010
EXTENSIONS
Name edited, terms a(8) and beyond added by Andrey Zabolotskiy, Sep 02 2022
STATUS
approved