n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 24 |
5 | 206 |
6 | 2260 |
7 | 30332 |
8 | 480902 |
9 | 8797200 |
10 | 182371078 |
11 | 4225266662 |
12 | 108194123116 |
13 | 3034250312354 |
14 | 92491819230694 |
15 | 3044898092216786 |
16 | 107664237385304338 |
17 | 4069395031874875828 |
18 | 163733361626947740668 |
[1,1,4,24,206,2260,30332,480902,8797200,182371078, 4225266662,108194123116,3034250312354, 92491819230694,3044898092216786, 107664237385304338,4069395031874875828, 163733361626947740668] |