n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 13 |
4 | 66 |
5 | 406 |
6 | 2868 |
7 | 23220 |
8 | 210192 |
9 | 2116656 |
10 | 23375520 |
11 | 281792160 |
12 | 3673814400 |
13 | 51599514240 |
14 | 775673176320 |
15 | 12440524320000 |
16 | 211848037632000 |
17 | 3820318338816000 |
18 | 72685037892096000 |
19 | 1455838255452672000 |
[1,3,13,66,406,2868,23220,210192,2116656,23375520, 281792160,3673814400,51599514240,775673176320, 12440524320000,211848037632000,3820318338816000, 72685037892096000,1455838255452672000] |