n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 12 |
4 | 60 |
5 | 360 |
6 | 2418 |
7 | 12544 |
8 | 58311 |
9 | 299520 |
10 | 2235324 |
11 | 14515200 |
12 | 122882760 |
13 | 1152592896 |
14 | 8365593600 |
15 | 81041688000 |
16 | 812657664000 |
17 | 8244072345600 |
18 | 78851793162240 |
19 | 701965262389248 |
20 | 5040363458592000 |
21 | 49476663690854400 |
[1,3,12,60,360,2418,12544,58311,299520,2235324, 14515200,122882760,1152592896,8365593600, 81041688000,812657664000,8244072345600, 78851793162240,701965262389248,5040363458592000, 49476663690854400] |