OFFSET
1,1
LINKS
William A. Stein, Dimensions of the spaces S_k(Gamma_0(N)).
William A. Stein, The modular forms database
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
Conjectures from Colin Barker, Jun 11 2019: (Start)
G.f.: x*(1 + x)*(11 + x) / (1 - x)^2.
a(n) = 2*a(n-1) - a(n-2) for n>3.
a(n) = 24*n-14 for n>1.
(End)
MATHEMATICA
CoefficientList[Series[(z^2 + 12 z + 11)/(z - 1)^2, {z, 0, 200}], z] (* Vladimir Joseph Stephan Orlovsky, Jun 14 2011 *)
PROG
(PARI) a(n)=if(n-1, 24*n-14, 11) \\ Charles R Greathouse IV, Jun 14 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 08 2001
STATUS
approved