n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 6 |
5 | 25 |
6 | 116 |
7 | 625 |
8 | 3757 |
9 | 25140 |
10 | 184511 |
11 | 1473861 |
12 | 12711339 |
13 | 117598686 |
14 | 1160399052 |
15 | 12152333659 |
16 | 134487937252 |
17 | 1566878426731 |
18 | 19154490559458 |
[1,2,6,25,116,625,3757,25140,184511,1473861, 12711339,117598686,1160399052,12152333659, 134487937252,1566878426731,19154490559458] |