n     a[n]  b[n]    r[n]    f(c[n])

 0    0     1.6     0.8     1.15067103588
 1    0     0.8     0.4     0.129679953964
 2    0     0.4     0.2    -0.418730753078
 3    0.2   0.4     0.1    -0.140818220682
 4    0.3   0.4     0.05   -0.00468808971871
 5    0.35  0.4     0.025   0.062710721209
 6    0.35  0.375   0.0125  0.0290656863214
 7    0.35  0.3625  0.00625 0.0122024760319