-48*n*(14 + 5*n + 5*n^2)*f[n] + 2*(558 + 281*n + 215*n^2 + 170*n^3)*
  f[1 + n] - (870 + 73*n + 210*n^2 + 135*n^3)*f[2 + n] + 
 2*(3 + n)*(14 - 5*n + 5*n^2)*f[3 + n]
