1,2

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.

Sequence in context: A124708 A126369 A133343 this_sequence A029827 A119123 A084821

Adjacent sequences: A027842 A027843 A027844 this_sequence A027846 A027847 A027848

nonn

N. J. A. Sloane (njas(AT)research.att.com).