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A097923 G.f.: (1+x^20)/((1-x)*(1-x^3)*(1-x^5)). 0
1, 1, 1, 2, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 18, 21, 23, 24, 27, 29, 32, 35, 37, 40, 43, 47, 50, 53, 57, 60, 65, 69, 72, 77, 81, 86, 91, 95, 100, 105, 111, 116, 121, 127, 132, 139, 145, 150, 157, 163, 170, 177, 183, 190, 197, 205, 212, 219, 227, 234, 243, 251, 258 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

G. van der Geer, Hilbert Modular Surfaces, Springer-Verlag, 1988; p. 191, Cor. 2.2.

LINKS

Table of n, a(n) for n=0..67.

Index entries for Molien series

Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1,1,-1,0,-1,1).

FORMULA

G.f.: (1+x^20)/((1-x)*(1-x^3)*(1-x^5)).

MATHEMATICA

CoefficientList[Series[(1 + x^20)/((1 - x)*(1 - x^3)*(1 - x^5)), {x, 0, 100}], x] (* Wesley Ivan Hurt, Mar 30 2017 *)

CROSSREFS

Sequence in context: A011885 A211524 A008672 * A027582 A259198 A011880

Adjacent sequences:  A097920 A097921 A097922 * A097924 A097925 A097926

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Sep 05 2004

STATUS

approved

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Last modified November 18 14:15 EST 2017. Contains 294893 sequences.