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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 87 |
| 5 | 841 |
| 6 | 11643 |
| 7 | 227893 |
| 8 | 6285807 |
| 9 | 243593041 |
| 10 | 13262556723 |
| 11 | 1014466283293 |
| 12 | 109128015915207 |
| 13 | 16521353903210521 |
| 14 | 3524056001906654763 |
| 15 | 1059868947134489801413 |
| 16 | 449831067019305308555487 |
| 17 | 269568708630308018001547681 |
| 18 | 228228540531327778410439620963 |
[1,1,3,13,87,841,11643,227893,6285807,243593041, 13262556723,1014466283293,109128015915207, 16521353903210521,3524056001906654763, 1059868947134489801413,449831067019305308555487, 269568708630308018001547681, 228228540531327778410439620963] |