n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 14 |
3 | 78 |
4 | 504 |
5 | 3720 |
6 | 30960 |
7 | 287280 |
8 | 2943360 |
9 | 33022080 |
10 | 402796800 |
11 | 5308934400 |
12 | 75203251200 |
13 | 1139544806400 |
14 | 18394619443200 |
15 | 315149522688000 |
16 | 5711921639424000 |
17 | 109196040425472000 |
18 | 2196014181064704000 |
19 | 46346783255764992000 |
20 | 1024251745442365440000 |
[1,3,14,78,504,3720,30960,287280,2943360,33022080, 402796800,5308934400,75203251200,1139544806400, 18394619443200,315149522688000,5711921639424000, 109196040425472000,2196014181064704000, 46346783255764992000,1024251745442365440000] |