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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 47 |
| 5 | 241 |
| 6 | 843 |
| 7 | 22019 |
| 8 | 217069 |
| 9 | 1092746 |
| 10 | 8870023 |
| 11 | 221167421 |
| 12 | 47255689914 |
| 13 | 82462576219 |
| 14 | 1043460553363 |
| 15 | 79180770078547 |
| 16 | 3215226335143217 |
| 17 | 23742453640900971 |
| 18 | 125781000834058567 |
[1,3,7,47,241,843,22019,217069,1092746,8870023, 221167421,47255689914,82462576219,1043460553363, 79180770078547,3215226335143217,23742453640900971, 125781000834058567] |