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A027846 Number of subgroups of index n in fundamental group of a certain fiber space. 0
1, 31, 247, 6363, 151211 (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

Sequence in context: A284926 A321544 A147963 * A042872 A142623 A089705

Adjacent sequences:  A027843 A027844 A027845 * A027847 A027848 A027849

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 26 22:42 EDT 2019. Contains 321565 sequences. (Running on oeis4.)