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: A059378 A024003 A147963 this_sequence A042872 A142623 A089705

Adjacent sequences: A027843 A027844 A027845 this_sequence A027847 A027848 A027849

nonn

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