n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 16 |
5 | 124 |
6 | 1256 |
7 | 15576 |
8 | 226248 |
9 | 3729216 |
10 | 68179968 |
11 | 1361836800 |
12 | 29501349120 |
13 | 693638208000 |
14 | 17815908096000 |
15 | 502048890201600 |
16 | 15388268595840000 |
17 | 500579319427891200 |
18 | 16817771937344716800 |
19 | 581609175119297740800 |
[1,1,3,16,124,1256,15576,226248,3729216,68179968, 1361836800,29501349120,693638208000, 17815908096000,502048890201600,15388268595840000, 500579319427891200,16817771937344716800, 581609175119297740800] |