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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 9 |
| 4 | 203 |
| 5 | 1333 |
| 6 | 1333 |
| 7 | 1333 |
| 8 | 2159 |
| 9 | 8309 |
| 10 | 18799 |
| 11 | 60499 |
| 12 | 60499 |
| 13 | 186779 |
| 14 | 186779 |
| 15 | 186779 |
| 16 | 12015573923 |
| 17 | 12015573923 |
| 18 | 6763513182767 |
[4,4,9,203,1333,1333,1333,2159,8309,18799,60499, 60499,186779,186779,186779,12015573923, 12015573923,6763513182767] |