OFFSET
1,1
LINKS
William A. Stein, Dimensions of the spaces S_k^{new}(Gamma_0(N))
William A. Stein, The modular forms database
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1)
FORMULA
From Colin Barker, Jan 22 2015: (Start)
a(n) = a(n-1) + a(n-3) - a(n-4) for n>5.
Empirical g.f.: -x*(x^4 - 6*x^3 - 8*x^2 - 9*x - 4) / ((x-1)^2*(x^2 + x + 1)).
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 10 2001
STATUS
approved