login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A027841 Number of subgroups of index n in fundamental group of a certain fiber space. 3
1, 31, 301, 6491, 151711 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

V. A. Liskovets and A. Mednykh, Enumeration of subgroups in the fundamental groups of orientable circle bundles over surfaces, Commun. in Algebra, 28, No. 4 (2000), 1717-1738.

LINKS

Table of n, a(n) for n=1..5.

CROSSREFS

Cf. A027838, A027839, A027840.

Sequence in context: A115151 A279980 A001298 * A221853 A000500 A141912

Adjacent sequences:  A027838 A027839 A027840 * A027842 A027843 A027844

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

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 October 14 14:45 EDT 2019. Contains 328019 sequences. (Running on oeis4.)