n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 36 |
4 | 168 |
5 | 1440 |
6 | 13920 |
7 | 134400 |
8 | 1619520 |
9 | 20549760 |
10 | 294631680 |
11 | 4449096960 |
12 | 74429752320 |
13 | 1312794362880 |
14 | 24870628823040 |
15 | 501316411115520 |
16 | 10661299747338240 |
17 | 239672059847700480 |
18 | 5664762159214878720 |
[1,2,4,36,168,1440,13920,134400,1619520,20549760, 294631680,4449096960,74429752320,1312794362880, 24870628823040,501316411115520,10661299747338240, 239672059847700480,5664762159214878720] |