n | a(n) |
---|---|
2 | 3 |
3 | 6 |
4 | 20 |
5 | 142 |
6 | 980 |
7 | 5664 |
8 | 34103 |
9 | 222723 |
10 | 1457520 |
11 | 9454124 |
12 | 62364092 |
13 | 420180854 |
14 | 2867177934 |
15 | 19717175542 |
16 | 136557037532 |
[3,6,20,142,980,5664,34103,222723,1457520,9454124, 62364092,420180854,2867177934,19717175542, 136557037532] |