n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 1 |
9 | 3 |
10 | 12 |
11 | 60 |
12 | 357 |
13 | 2508 |
14 | 20100 |
15 | 181080 |
16 | 1811886 |
17 | 19938270 |
18 | 239319540 |
19 | 3111697260 |
20 | 43569197270 |
21 | 653597773860 |
22 | 10458282340380 |
23 | 177800134878240 |
24 | 3200533135400175 |
25 | 60812090365924905 |
26 | 1216273182165519240 |
27 | 25542270225880538760 |
[0,0,0,0,0,0,0,0,1,3,12,60,357,2508,20100,181080, 1811886,19938270,239319540,3111697260,43569197270, 653597773860,10458282340380,177800134878240, 3200533135400175,60812090365924905, 1216273182165519240,25542270225880538760] |