n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 100 |
6 | 600 |
7 | 3150 |
8 | 15750 |
9 | 78000 |
10 | 390000 |
11 | 1952500 |
12 | 9768750 |
13 | 48831250 |
14 | 244125000 |
15 | 1220625000 |
16 | 6103437500 |
17 | 30517656250 |
18 | 152588281250 |
19 | 762939062500 |
20 | 3814695312500 |
21 | 19073484375000 |
22 | 95367441406250 |
23 | 476837167968750 |
24 | 2384185742187500 |
25 | 11920928710937500 |
[0,2,6,20,100,600,3150,15750,78000,390000,1952500, 9768750,48831250,244125000,1220625000,6103437500, 30517656250,152588281250,762939062500, 3814695312500,19073484375000,95367441406250, 476837167968750,2384185742187500, 11920928710937500] |