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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
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: A284926 A321544 A147963 * A042872 A142623 A089705
KEYWORD
nonn
AUTHOR
STATUS
approved