login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A176709 Number of isomorphism classes of multiple coverings of graphs with specified Betti number. See references for precise definition. 0
1, 11, 901, 524137, 373486525, 268749463729, 193492277719861, 139314094050615817 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

M. W. Hero and J. F. Willenbring, Stable Hilbert series as related to the measurement of quantum entanglement, Discrete Math., 309 (2010), 6508-6514.

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..7.

CROSSREFS

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 9 02:20 EST 2021. Contains 341961 sequences. (Running on oeis4.)