n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 1 |
10 | 1 |
11 | 15 |
12 | 15 |
13 | 140 |
14 | 140 |
15 | 1050 |
16 | 1050 |
17 | 6951 |
18 | 6951 |
19 | 42525 |
20 | 42525 |
21 | 246730 |
22 | 246730 |
23 | 1379400 |
24 | 1379400 |
25 | 7508501 |
26 | 7508501 |
27 | 40075035 |
28 | 40075035 |
29 | 210766920 |
30 | 210766920 |
31 | 1096190550 |
[0,0,0,0,0,0,0,0,1,1,15,15,140,140,1050,1050,6951, 6951,42525,42525,246730,246730,1379400,1379400, 7508501,7508501,40075035,40075035,210766920, 210766920,1096190550] |