A176709 - OEIS

%I #13 Sep 02 2022 06:09:27

%S 1,11,901,524137,373486525,268749463729,193492277719861,

%T 139314094050615817,100306131218514392365,72220413687258533050849,

%U 51998697816934668649790821,37439062426374732606941352697,26956124946902542404909380816605,19408409961765641983297475951692369

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

%D 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.

%H M. W. Hero and J. F. Willenbring, <a href="https://doi.org/10.1016/j.disc.2009.06.021">Stable Hilbert series as related to the measurement of quantum entanglement</a>, Discrete Math., 309 (2010), 6508-6514.

%Y Row 6 of A160449.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Dec 07 2010

%E Name edited, terms a(8) and beyond added by _Andrey Zabolotskiy_, Sep 02 2022