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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 450 |
| 3 | 2829 |
| 4 | 32303 |
| 5 | 128441 |
| 6 | 1117207 |
| 7 | 3696933 |
| 8 | 30649693 |
| 9 | 90914453 |
| 10 | 784186403 |
| 11 | 2141552549 |
| 12 | 19980003873 |
| 13 | 50876741513 |
| 14 | 520249434779 |
| 15 | 1246972578665 |
| 16 | 13942225071453 |
| 17 | 31756214522413 |
| 18 | 383944691019691 |
| 19 | 839150694697605 |
[15,450,2829,32303,128441,1117207,3696933, 30649693,90914453,784186403,2141552549, 19980003873,50876741513,520249434779, 1246972578665,13942225071453,31756214522413, 383944691019691,839150694697605] |