I'll help you code up the formula. You've got to come up with the details of what you want to award.
To get us started:
if(finalTable, prizePool - pow(if(r = 1, 0, r), 2)) + nh * 2
This gives points like this:
1: 180
2: 176
3: 171
4: 164
5: 155
6: 144
7: 131
8: 116
9: 0
10: 0
11: 0
12: 0
13: 0
14: 0
15: 0
16: 0
17: 0
18: 0
19: 0
20: 0
This formula includes points for knocking other players out (nh * 2). For a bounty, you should set up a Prize.