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| n | a(n) |
|---|---|
| 2 | 5 |
| 3 | 23 |
| 4 | 83 |
| 5 | 1973 |
| 6 | 1151 |
| 7 | 20959 |
| 8 | 40609 |
| 9 | 1627853 |
| 10 | 57323489 |
| 11 | 1616436271 |
| 12 | 6814548563 |
| 13 | 217642750067 |
[5,23,83,1973,1151,20959,40609,1627853,57323489, 1616436271,6814548563,217642750067] |