A258691 Total number of congruence subgroups of PSL(2,Z) of genus n.

1116, 2801, 4107, 6513, 7257, 9386, 10416, 18191, 13726, 21014, 15622, 27466, 18095, 33241, 22871, 40880, 30809, 54794, 24935, 60648, 31137, 66841, 36135, 59450, 42289

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: A027622 A259295 A260103 * A221428 A161848 A020380

Adjacent sequences: A258688 A258689 A258690 * A258692 A258693 A258694

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 07 2015

Status

approved