n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 48 |
6 | 192 |
7 | 960 |
8 | 5760 |
9 | 34560 |
10 | 241920 |
11 | 1935360 |
12 | 15482880 |
13 | 139345920 |
14 | 1393459200 |
15 | 13934592000 |
16 | 153280512000 |
17 | 1839366144000 |
18 | 22072393728000 |
19 | 286941118464000 |
20 | 4017175658496000 |
21 | 56240459218944000 |
[1,1,2,4,12,48,192,960,5760,34560,241920,1935360, 15482880,139345920,1393459200,13934592000, 153280512000,1839366144000,22072393728000, 286941118464000,4017175658496000, 56240459218944000] |