n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 192 |
5 | 3000 |
6 | 56160 |
7 | 1234800 |
8 | 32256000 |
9 | 979776000 |
10 | 33566400000 |
11 | 1279932192000 |
12 | 53950908211200 |
13 | 2490951541478400 |
14 | 124914111972249600 |
15 | 6761428395321600000 |
16 | 393000294670663680000 |
17 | 24412776290272161792000 |
18 | 1613964246117021646848000 |
19 | 113146793781167491817472000 |
[1,4,18,192,3000,56160,1234800,32256000,979776000, 33566400000,1279932192000,53950908211200, 2490951541478400,124914111972249600, 6761428395321600000,393000294670663680000, 24412776290272161792000,1613964246117021646848000, 113146793781167491817472000] |