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A258691
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Total number of congruence subgroups of PSL(2,Z) of genus n.
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10
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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
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listen;
history;
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internal format)
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OFFSET
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0,1
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LINKS
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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.
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CROSSREFS
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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
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Jun 07 2015
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STATUS
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approved
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