n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 14 |
4 | 78 |
5 | 544 |
6 | 4560 |
7 | 42468 |
8 | 451584 |
9 | 5382144 |
10 | 69737760 |
11 | 985265280 |
12 | 15204119040 |
13 | 249602065920 |
14 | 4398839827200 |
15 | 82834744849920 |
16 | 1646970433920000 |
17 | 34626184595251200 |
18 | 769149445849989120 |
19 | 17896198498368583680 |
20 | 437123791096022016000 |
21 | 11171177571932111462400 |
[1,1,3,14,78,544,4560,42468,451584,5382144, 69737760,985265280,15204119040,249602065920, 4398839827200,82834744849920,1646970433920000, 34626184595251200,769149445849989120, 17896198498368583680,437123791096022016000, 11171177571932111462400] |