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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 449 |
| 3 | 13455 |
| 4 | 403201 |
| 5 | 12082575 |
| 6 | 362074049 |
| 7 | 10850138895 |
| 8 | 325142092801 |
| 9 | 9743412645135 |
| 10 | 291977237261249 |
| 11 | 8749573705192335 |
| 12 | 262195233918508801 |
| 13 | 7857107443850071695 |
| 14 | 235451028081583642049 |
| 15 | 7055673735003659189775 |
| 16 | 211434761022028192051201 |
[1,15,449,13455,403201,12082575,362074049, 10850138895,325142092801,9743412645135, 291977237261249,8749573705192335, 262195233918508801,7857107443850071695, 235451028081583642049,7055673735003659189775, 211434761022028192051201] |