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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 4705 |
| 4 | 44879 |
| 5 | 472412 |
| 6 | 5179587 |
| 7 | 56006452 |
| 8 | 599130203 |
| 9 | 6415489317 |
| 10 | 68862978274 |
| 11 | 739329103913 |
| 12 | 7933883243105 |
| 13 | 85128813219141 |
| 14 | 913482746325836 |
| 15 | 9802626037683613 |
| 16 | 105191549603928895 |
| 17 | 1128793872954895887 |
[21,441,4705,44879,472412,5179587,56006452, 599130203,6415489317,68862978274,739329103913, 7933883243105,85128813219141,913482746325836, 9802626037683613,105191549603928895, 1128793872954895887] |