|
| |
|
|
A258696
|
|
Total number of torsion-free congruence subgroups of PSL(2,Z) of genus n.
|
|
0
|
|
|
|
254, 459, 672, 1809, 1665, 3028, 1780, 6216, 2671, 6711, 4483, 8450, 4978, 12447, 4581, 16743, 8607, 17453, 4819, 24287, 9396, 27542, 11206, 22798, 6903
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,1
|
|
|
LINKS
|
Table of n, a(n) for n=0..24.
C. J. Cummins and S. Pauli, Congruence Subgroups of PSL(2,Z) of Genus Less than or Equal to 24, Experiment. Math. Volume 12, Issue 2 (2003), 243-255. See Table 1.
|
|
|
CROSSREFS
|
A258691, A102474, A258693-A258700 give the ten sequences in Table 1 of Cummins and Pauli (2003).
Sequence in context: A144855 A110827 A062664 * A158249 A255178 A196738
Adjacent sequences: A258693 A258694 A258695 * A258697 A258698 A258699
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
N. J. A. Sloane, Jun 07 2015
|
|
|
STATUS
|
approved
|
| |
|
|
