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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 145 |
| 5 | 1657 |
| 6 | 23779 |
| 7 | 411329 |
| 8 | 8335233 |
| 9 | 193742001 |
| 10 | 5082443619 |
| 11 | 148557955537 |
| 12 | 4788293136081 |
| 13 | 168731904680809 |
| 14 | 6453754733373315 |
| 15 | 266292315945201409 |
| 16 | 11790632930559453313 |
| 17 | 557631368540974947169 |
[1,1,3,17,145,1657,23779,411329,8335233,193742001, 5082443619,148557955537,4788293136081, 168731904680809,6453754733373315, 266292315945201409,11790632930559453313, 557631368540974947169] |