n | a(n) |
---|---|
0 | -1 |
1 | -1 |
2 | -1 |
3 | 2 |
4 | 3 |
5 | 4 |
6 | 5 |
7 | 29 |
8 | 41 |
9 | 55 |
10 | 71 |
11 | 881 |
12 | 791 |
13 | 9360 |
14 | 10009 |
15 | 1079 |
16 | 30239 |
17 | -1 |
18 | 246960 |
19 | -1 |
20 | 636481 |
21 | 1360800 |
22 | 3160079 |
23 | -1 |
24 | 2162161 |
[-1,-1,-1,2,3,4,5,29,41,55,71,881,791,9360,10009, 1079,30239,-1,246960,-1,636481,1360800,3160079,-1, 2162161] |