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) = a(n-1)+a(n-3)-a(n-4) for n>5. G.f.: x*(1+x)*(9+12*x+10*x^2+x^3)/((1-x)^2*(1+x+x^2)). [Colin Barker, Sep 26 2012]
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 08 2001
STATUS
approved