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A045615 Genus 0 subgroups of PSL(2,Z) up to conjugacy - by level. 0
1, 3, 4, 7, 8, 12, 11, 18, 10, 7, 2, 11, 3, 4, 4, 9, 0, 6, 0, 1, 2, 0, 0, 1, 2, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

Cox,D.A. and Parry, W.R. Crelle J., 351, pp. 66 - 112

CROSSREFS

Sequence in context: A050032 A014602 A078823 * A051201 A026449 A165157

Adjacent sequences:  A045612 A045613 A045614 * A045616 A045617 A045618

KEYWORD

hard,nonn

AUTHOR

John McKay (mckay(AT)cs.concordia.ca)

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.