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A029936 Number of cusps of Gamma_1(n)\P_1(Q). 2
1, 2, 2, 3, 4, 4, 6, 6, 8, 8, 10, 10, 12, 12, 16, 14, 16, 16, 18, 20, 24, 20, 22, 24, 28, 24, 30, 30, 28, 32, 30, 32, 40, 32, 48, 40, 36, 36, 48, 48, 40, 48, 42, 50, 64, 44, 46, 56, 60, 56, 64, 60, 52, 60, 80, 72, 72, 56 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

F. Hirzebruch et al., Manifolds and Modular Forms, Vieweg, 2nd ed. 1994, p. 158.

FORMULA

Except for n=1, 2, 4, this is A029935 / 2.

CROSSREFS

Sequence in context: A138369 A173332 A138374 * A114093 A077768 A143038

Adjacent sequences:  A029933 A029934 A029935 * A029937 A029938 A029939

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 01:29 EST 2012. Contains 205860 sequences.