n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 12 |
5 | 30 |
6 | 90 |
7 | 420 |
8 | 2240 |
9 | 13440 |
10 | 84000 |
11 | 577500 |
12 | 4331250 |
13 | 36036000 |
14 | 322882560 |
15 | 3099672576 |
16 | 31513337856 |
17 | 340409701632 |
18 | 3893435962416 |
19 | 47122428697344 |
20 | 600341948743680 |
21 | 8030803773358080 |
22 | 112453396587417600 |
23 | 1646232972560748000 |
24 | 25147419121286426250 |
[1,1,2,6,12,30,90,420,2240,13440,84000,577500, 4331250,36036000,322882560,3099672576,31513337856, 340409701632,3893435962416,47122428697344, 600341948743680,8030803773358080, 112453396587417600,1646232972560748000, 25147419121286426250] |