n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 6 |
6 | 1 |
7 | 6 |
8 | 90 |
9 | 1680 |
10 | 1 |
11 | 24 |
12 | 2520 |
13 | 369600 |
14 | 63063000 |
15 | 1 |
16 | 120 |
17 | 113400 |
18 | 168168000 |
19 | 305540235000 |
20 | 623360743125120 |
21 | 1 |
22 | 720 |
23 | 7484400 |
24 | 137225088000 |
25 | 3246670537110000 |
26 | 88832646059788350720 |
27 | 2670177736637149247308800 |
[1,1,1,1,2,6,1,6,90,1680,1,24,2520,369600, 63063000,1,120,113400,168168000,305540235000, 623360743125120,1,720,7484400,137225088000, 3246670537110000,88832646059788350720, 2670177736637149247308800] |