0	1
1	256/243
2	16/15
3	10/9
4	9/8
5	32/27
6	6/5
7	5/4
8	81/64
9	4/3
10	27/20
11	45/32
12	40/27
13	3/2
14	128/81
15	8/5
16	5/3
17	27/16
18	16/9
19	9/5
20	15/8
21	243/128
