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A063089 Dimension of the space of weight 2n cusp forms for Gamma_0( 21 ). 0
1, 6, 12, 16, 22, 28, 32, 38, 44, 48, 54, 60, 64, 70, 76, 80, 86, 92, 96, 102, 108, 112, 118, 124, 128, 134, 140, 144, 150, 156, 160, 166, 172, 176, 182, 188, 192, 198, 204, 208, 214, 220, 224, 230, 236, 240, 246, 252, 256, 262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..50.

William A. Stein, Dimensions of the spaces S_k(Gamma_0(N)).

William A. Stein, The modular forms database

FORMULA

Conjectures from Colin Barker, Jun 09 2019: (Start)

G.f.: x*(1 + x)*(1 + 4*x + 2*x^2 + x^3) / ((1 - x)^2*(1 + x + x^2)).

a(n) = a(n-1) + a(n-3) - a(n-4) for n>5.

(End)

CROSSREFS

Sequence in context: A315647 A315648 A315649 * A315650 A315651 A315652

Adjacent sequences:  A063086 A063087 A063088 * A063090 A063091 A063092

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 08 2001

STATUS

approved

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)