A176709 Number of isomorphism classes of 6-fold coverings of a connected graph with Betti number n.

1, 11, 901, 524137, 373486525, 268749463729, 193492277719861, 139314094050615817, 100306131218514392365, 72220413687258533050849, 51998697816934668649790821, 37439062426374732606941352697, 26956124946902542404909380816605, 19408409961765641983297475951692369

Offset: 0

Author

N. J. A. Sloane, Dec 07 2010

Keywords

• nonn

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.

Extensions

Name edited, terms a(8) and beyond added by Andrey Zabolotskiy, Sep 02 2022