h0(x) = 2
h1(x) = 2 * sin(x)
h3(x) = 2 / 3 * sin(3 * x)
h5(x) = 2 / 5 * sin(5 * x)
h7(x) = 2 / 7 * sin(7 * x)
s13(x) = h1(x) + h3(x)
s135(x) = h1(x) + h3(x) + h5(x)
s1357(x) = h1(x) + h3(x) + h5(x) + h7(x)
h9(x) = 2 / 9 * sin(9 * x)
s13579(x) = h1(x) + h3(x) + h5(x) + h7(x) + h9(x)