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.

Cf. A027838, A027839, A027840.

Sequence in context: A008386 A115151 A001298 this_sequence A000500 A141912 A002225

Adjacent sequences: A027838 A027839 A027840 this_sequence A027842 A027843 A027844

nonn

njas