n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 20 |
5 | 155 |
6 | 1716 |
7 | 24654 |
8 | 434155 |
9 | 9043990 |
10 | 217457456 |
11 | 5926620029 |
12 | 180538177590 |
13 | 6078622845750 |
14 | 224156328707221 |
15 | 8984765008810504 |
16 | 388939866084222200 |
17 | 18083736252080051435 |
18 | 898779656769444326136 |
19 | 47551736771345760732954 |
[1,4,20,155,1716,24654,434155,9043990,217457456, 5926620029,180538177590,6078622845750, 224156328707221,8984765008810504, 388939866084222200,18083736252080051435, 898779656769444326136,47551736771345760732954] |