n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 96 |
3 | 1620 |
4 | 17920 |
5 | 157500 |
6 | 1197504 |
7 | 8240232 |
8 | 52715520 |
9 | 318995820 |
10 | 1847560000 |
11 | 10328229912 |
12 | 56073378816 |
13 | 297051536600 |
14 | 1541119305600 |
15 | 7852824450000 |
16 | 39392404439040 |
17 | 194905125100620 |
18 | 952671403252800 |
[0,2,96,1620,17920,157500,1197504,8240232, 52715520,318995820,1847560000,10328229912, 56073378816,297051536600,1541119305600, 7852824450000,39392404439040,194905125100620, 952671403252800] |