OFFSET
2,2
LINKS
William A. Stein, Dimensions of the spaces S_k^{new}(Gamma_1(N))
William A. Stein, The modular forms database
FORMULA
a(n) = (-(-1)^n+198*n-423)/2 for n>2. a(n) = a(n-1)+a(n-2)-a(n-3) for n>5. G.f.: x^2*(-1+87*x+99*x^2+13*x^3)/((1-x)^2*(1+x)). [Colin Barker, Sep 28 2012]
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jul 14 2001
STATUS
approved