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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 599 |
| 3 | 69671 |
| 4 | 7176194 |
| 5 | 722149510 |
| 6 | 72839521581 |
| 7 | 7337927223290 |
| 8 | 739300928401336 |
| 9 | 74484943708241718 |
| 10 | 7504342874539244449 |
| 11 | 756062619205812384051 |
| 12 | 76173283584466268712696 |
| 13 | 7674456207021624430421367 |
[21,599,69671,7176194,722149510,72839521581, 7337927223290,739300928401336,74484943708241718, 7504342874539244449,756062619205812384051, 76173283584466268712696,7674456207021624430421367] |