OFFSET
1,1
LINKS
William A. Stein, Dimensions of the spaces S_k(Gamma_0(N)).
William A. Stein, The modular forms database
FORMULA
Conjecture: a(n) = 24*n-20 for n>1. a(n) = 2*a(n-1)-a(n-2) for n>3. G.f.: x*(5+18*x+x^2)/(1-x)^2. [Colin Barker, Sep 23 2012]
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 08 2001
STATUS
approved