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

0,2

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

Table of n, a(n) for n=0..13.

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

Adjacent sequences: A176706 A176707 A176708 * A176710 A176711 A176712

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