n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 20 |
5 | 250 |
6 | 2500 |
7 | 21875 |
8 | 175000 |
9 | 1312500 |
10 | 9375000 |
11 | 64453125 |
12 | 429687500 |
13 | 2792968750 |
14 | 17773437500 |
15 | 111083984375 |
16 | 683593750000 |
17 | 4150390625000 |
18 | 24902343750000 |
19 | 147857666015625 |
20 | 869750976562500 |
21 | 5073547363281250 |
[0,0,0,1,20,250,2500,21875,175000,1312500,9375000, 64453125,429687500,2792968750,17773437500, 111083984375,683593750000,4150390625000, 24902343750000,147857666015625,869750976562500, 5073547363281250] |