

A258697


Number of torsionfree congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PSL(2,Z).


0



33, 48, 49, 108, 87, 133, 55, 213, 83, 208, 133, 195, 93, 343, 72, 289, 143, 351, 71, 411, 122, 504, 152, 312, 78
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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 , Experimental Math., 12 (2), 2003, 243255. See Table 1.


CROSSREFS

A258691, A102474, A258693A258700 give the ten sequences in Table 1 of Cummins and Pauli (2003).
Sequence in context: A111458 A179244 A258698 * A204373 A111502 A080933
Adjacent sequences: A258694 A258695 A258696 * A258698 A258699 A258700


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Jun 07 2015


STATUS

approved



