n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 47 |
6 | 105 |
7 | 1272 |
8 | 8424 |
9 | 55856 |
10 | 388800 |
11 | 6592492 |
12 | 37965600 |
13 | 1573051680 |
14 | 10106845824 |
15 | 145938179520 |
16 | 2694653982720 |
17 | 18948491739696 |
18 | 267048208800000 |
19 | 23293245955795200 |
20 | 466687809894297600 |
21 | 3372079713556377600 |
[1,1,2,5,47,105,1272,8424,55856,388800,6592492, 37965600,1573051680,10106845824,145938179520, 2694653982720,18948491739696,267048208800000, 23293245955795200,466687809894297600, 3372079713556377600] |