What's the answer for n=3? Is it 8/15 or not?
--Checking...--Checked--
It really seems to be 8/15...

Edited by author 09.04.2008 23:26

2: 2/3
3: 8/15
4: 13/28
5: 19/45
6: 13/33

I've got this examples after 15-minute execution of program. :-)
I can not understand how to solve this problem, but I want to solve it myself.