A027840
Number of subgroups of index n in fundamental group of a certain fiber space.
Original entry on oeis.org
1, 15, 220, 5275, 151086, 6605004, 362069912, 26370058035, 2384037107365, 264380945199210, 35133143655934644, 5515729438742221708, 1009373492449379367974, 212997911074525038601560, 51337590023913924398371080, 14016616814674335739387516003
Offset: 1
Third term corrected from 240 to 220, Aug 15 1999
A027839
Number of subgroups of index n in fundamental group of a certain fiber space.
Original entry on oeis.org
1, 15, 124, 2431, 68766, 3025596, 173773496, 12786773247, 1169623901221, 130305653188890, 17376934722757908, 2733655198336260124, 501034099176714376118, 105847486572700895182728, 25534322201330399433420024, 6976464857439636995547805183
Offset: 1
- 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.
- R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.13(c), Eq. (5.125).
A027841
Number of subgroups of index n in fundamental group of a certain fiber space.
Original entry on oeis.org
1, 31, 301, 6491, 151711, 6673555, 362072313, 26375525171, 2384038557346, 264381564291841, 35133143655949285, 5515729547285229215, 1009373492449379396535, 212997911098253654157543, 51337590023914004777654131, 14016616814681248497416279139
Offset: 1
A027842
Number of subgroups of index n in fundamental group of a certain fiber space.
Original entry on oeis.org
1, 7, 34, 227, 1296, 10576, 77554, 729379, 7013419, 77371042, 910455096, 11877617828, 165087132666, 2480783846184, 39677415301224, 675818886754115, 12180498014887816, 231893906693650507, 4645789707491981892, 97740610362119850762, 2153888078209948673032
Offset: 1
Showing 1-4 of 4 results.