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| n | a(n) |
|---|---|
| 2 | 7 |
| 3 | 13 |
| 4 | 0 |
| 5 | 31 |
| 6 | 43 |
| 7 | 2801 |
| 8 | 73 |
| 9 | 0 |
| 10 | 1111111111111111111 |
| 11 | 50544702849929377 |
| 12 | 157 |
| 13 | 30941 |
| 14 | 211 |
| 15 | 241 |
| 16 | 0 |
| 17 | 307 |
[7,13,0,31,43,2801,73,0,1111111111111111111, 50544702849929377,157,30941,211,241,0,307] |