n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 6 |
4 | 30 |
5 | 150 |
6 | 650 |
7 | 3150 |
8 | 15500 |
9 | 78000 |
10 | 390000 |
11 | 1952500 |
12 | 9762500 |
13 | 48831250 |
14 | 244156250 |
15 | 1220781250 |
16 | 6103593750 |
17 | 30517656250 |
18 | 152587500000 |
19 | 762939062500 |
20 | 3814695312500 |
21 | 19073484375000 |
22 | 95367421875000 |
23 | 476837167968750 |
24 | 2384185839843750 |
25 | 11920929199218750 |
[0,0,6,30,150,650,3150,15500,78000,390000,1952500, 9762500,48831250,244156250,1220781250,6103593750, 30517656250,152587500000,762939062500, 3814695312500,19073484375000,95367421875000, 476837167968750,2384185839843750, 11920929199218750] |