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%I #14 Jun 04 2016 07:56:56
%S 254,459,672,1809,1665,3028,1780,6216,2671,6711,4483,8450,4978,12447,
%T 4581,16743,8607,17453,4819,24287,9396,27542,11206,22798,6903
%N Total number of torsion-free congruence subgroups of PSL(2,Z) of genus n.
%H C. J. Cummins and S. Pauli, <a href="https://www.emis.de/journals/EM/expmath/volumes/12/12.2/pp243_255.pdf">Congruence Subgroups of PSL(2,Z) of Genus Less than or Equal to 24</a>, Experiment. Math. Volume 12, Issue 2 (2003), 243-255. See Table 1.
%Y A258691, A102474, A258693-A258700 give the ten sequences in Table 1 of Cummins and Pauli (2003).
%K nonn,more
%O 0,1
%A _N. J. A. Sloane_, Jun 07 2015
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