n | a(n) |
---|---|
2 | 2 |
3 | 3 |
4 | 6 |
5 | 20 |
6 | 80 |
7 | 420 |
8 | 2520 |
9 | 18144 |
10 | 145152 |
11 | 1330560 |
12 | 13305600 |
13 | 148262400 |
14 | 1779148800 |
15 | 23351328000 |
16 | 326918592000 |
17 | 4940103168000 |
18 | 79041650688000 |
19 | 1351612226764800 |
20 | 24329020081766400 |
21 | 464463110651904000 |
22 | 9289262213038080000 |
23 | 195848611658219520000 |
[2,3,6,20,80,420,2520,18144,145152,1330560, 13305600,148262400,1779148800,23351328000, 326918592000,4940103168000,79041650688000, 1351612226764800,24329020081766400, 464463110651904000,9289262213038080000, 195848611658219520000] |