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A102474 Number of congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PSL(2,Z). 10
132, 187, 177, 284, 261, 303, 230, 480, 277, 469, 304, 489, 269, 664, 268, 596, 410, 819, 273, 812, 308, 888, 365, 686, 336 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..24.

C. Cummins and S. Pauli, Congruence Subgroups of PSL(2,Z) [broken link?]

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, 243-255.

CROSSREFS

A258691, A102474, A258693-A258700 give the ten sequences in Table 1 of Cummins and Pauli (2003).

Sequence in context: A108601 A039603 A030026 * A015235 A204649 A224548

Adjacent sequences:  A102471 A102472 A102473 * A102475 A102476 A102477

KEYWORD

more,nonn

AUTHOR

Kok Seng Chua (chuaks(AT)ihpc.a-star.edu.sg), Feb 23 2005

STATUS

approved

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Last modified March 26 00:29 EDT 2019. Contains 321479 sequences. (Running on oeis4.)