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A027845
Number of subgroups of index n in fundamental group of a certain fiber space.
1
1, 15, 43, 371, 1321, 11979
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.
CROSSREFS
Sequence in context: A126369 A193647 A133343 * A201810 A364081 A292018
KEYWORD
nonn
AUTHOR
STATUS
approved