OFFSET
1,1
LINKS
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 08 2019: (Start)
G.f.: x*(9 + 22*x + x^2) / (1 - x)^2.
a(n) = 2*a(n-1) - a(n-2) for n > 3.
a(n) = 8*(4*n-3) for n > 1.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 08 2001
STATUS
approved