1.0     -1.0    3.0     -5.0    11.0    -21.0
        1.0     -0.5    1.75    -1.625  3.4375  -4.15625
        1.0     0.0     1.0     0.0     1.0     0.0
        1.0     0.5     0.75    0.625   0.6875  0.65625
        1.0     1.0     1.0     1.0     1.0     1.0
        1.0     1.5     1.75    1.875   1.9375  1.96875
        1.0     2.0     3.0     4.0     5.0     6.0
        1.0     2.5     4.75    8.125   13.1875 20.78125
        1.0     3.0     7.0     15.0    31.0    63.0