n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 18 |
4 | 216 |
5 | 3720 |
6 | 81360 |
7 | 2172240 |
8 | 68423040 |
9 | 2484639360 |
10 | 102190636800 |
11 | 4695453100800 |
12 | 238382331264000 |
13 | 13251891094041600 |
14 | 800600878273996800 |
15 | 52229642780899584000 |
16 | 3659347096696811520000 |
17 | 274040260725697449984000 |
[0,1,2,18,216,3720,81360,2172240,68423040, 2484639360,102190636800,4695453100800, 238382331264000,13251891094041600, 800600878273996800,52229642780899584000, 3659347096696811520000,274040260725697449984000] |