n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 360 |
6 | 2160 |
7 | 7560 |
8 | 241920 |
9 | 8164800 |
10 | 145756800 |
11 | 1736380800 |
12 | 34488115200 |
13 | 1416906691200 |
14 | 46117316044800 |
15 | 1085696644032000 |
16 | 26627911620710400 |
17 | 1054301997805056000 |
18 | 46867776416068608000 |
19 | 1726488804870679449600 |
20 | 58404671366139850752000 |
[1,1,0,0,24,360,2160,7560,241920,8164800, 145756800,1736380800,34488115200,1416906691200, 46117316044800,1085696644032000,26627911620710400, 1054301997805056000,46867776416068608000, 1726488804870679449600,58404671366139850752000] |