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Here's my results from bc (source included). More or less matches.
4 03.9250
5 13.0833
6 26.2363
7 41.1049
8 55.5605
9 68.1762
10 78.2982
11 85.8724
12 91.2068
13 94.7630
14 97.0152
15 98.3730
16 99.1529
17 99.5794
18 99.8014
19 99.9111
20 99.9624
Attachments:
bc.png (6 Kb)