n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 42 |
4 | 704 |
5 | 16300 |
6 | 482112 |
7 | 17366776 |
8 | 737738752 |
9 | 36109329552 |
10 | 2001104000000 |
11 | 123856655495584 |
12 | 8468525621182464 |
13 | 633915692700252352 |
14 | 51562270240172425216 |
15 | 4528439794201950000000 |
16 | 427082984690083973562368 |
17 | 43049504748861000404766976 |
[1,1,4,42,704,16300,482112,17366776,737738752, 36109329552,2001104000000,123856655495584, 8468525621182464,633915692700252352, 51562270240172425216,4528439794201950000000, 427082984690083973562368, 43049504748861000404766976] |