n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 12 |
4 | 68 |
5 | 525 |
6 | 5262 |
7 | 65674 |
8 | 987408 |
9 | 17426565 |
10 | 353759300 |
11 | 8127640224 |
12 | 208600774032 |
13 | 5917247520457 |
14 | 183872561612040 |
15 | 6212370268252950 |
16 | 226762373954676608 |
17 | 8893485959056048521 |
18 | 372980176625914811568 |
19 | 16656844860594186642100 |
20 | 789196576594282265505600 |
[1,3,12,68,525,5262,65674,987408,17426565, 353759300,8127640224,208600774032,5917247520457, 183872561612040,6212370268252950, 226762373954676608,8893485959056048521, 372980176625914811568,16656844860594186642100, 789196576594282265505600] |