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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 90 |
| 4 | 1154 |
| 5 | 17427 |
| 6 | 309117 |
| 7 | 6285102 |
| 8 | 144603015 |
| 9 | 3717580810 |
| 10 | 105696353842 |
| 11 | 3293810230381 |
| 12 | 111651093529948 |
| 13 | 4089889271054734 |
| 14 | 160989247361249558 |
| 15 | 6776381334102511286 |
| 16 | 303712681809603918633 |
| 17 | 14439887378431671417669 |
[1,1,9,90,1154,17427,309117,6285102,144603015, 3717580810,105696353842,3293810230381, 111651093529948,4089889271054734, 160989247361249558,6776381334102511286, 303712681809603918633,14439887378431671417669] |