|------------------------------+-------------------|
| Fitting polynom              | Function          |
|------------------------------+-------------------|
| 1.00  log2(N)   +  1.25e-015 | N                 |
| 2.00  log2(N)   +  5.31e-018 | N*N               |
| 1.19  log2(N)   +      1.116 | N*log2(N)         |
| 1.37  log2(N)   +      2.232 | N*log2(N)*log2(N) |

len          !         !2       !234   !2345678
-------------------------------------------------------
 0       1      0.000      0.000      0.000      0.000
 1       2      0.000      0.000      0.000      0.000
 2       4      0.000      0.000      0.000      0.000
 3       8      0.001      0.001      0.001      0.001
 4      16      0.002      0.001      0.001      0.002
 5      32      0.002      0.004      0.004      0.004
 6      64      0.005      0.006      0.009      0.014
 7     128      0.013      0.019      0.028      0.043
 8     256      0.042      0.057      0.087      0.148
 9     512      0.118      0.174      0.302      0.559
10    1024      0.354      0.606      1.124      2.279
11    2048      1.220      2.242      4.545     10.041
12    4096      4.517      8.982     19.706     41.568
13    8192     17.864     39.063     82.814    169.274
14   16384     78.454    165.893    337.830    718.843