n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 24 |
4 | 120 |
5 | 720 |
6 | 4920 |
7 | 37320 |
8 | 309120 |
9 | 2763720 |
10 | 26440920 |
11 | 268864320 |
12 | 2889978120 |
13 | 32689371720 |
14 | 387638491920 |
15 | 4803456571320 |
16 | 62026296732120 |
17 | 832595493624720 |
18 | 11592967532632920 |
19 | 167119530011233320 |
20 | 2489936579950221120 |
21 | 38283169922493447720 |
[1,2,6,24,120,720,4920,37320,309120,2763720, 26440920,268864320,2889978120,32689371720, 387638491920,4803456571320,62026296732120, 832595493624720,11592967532632920, 167119530011233320,2489936579950221120, 38283169922493447720] |