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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 189 |
| 4 | 4864 |
| 5 | 159375 |
| 6 | 6578496 |
| 7 | 323652399 |
| 8 | 18572378112 |
| 9 | 1216112914971 |
| 10 | 89530000000000 |
| 11 | 7319100286183983 |
| 12 | 657910135976361984 |
| 13 | 64494528072860946073 |
| 14 | 6847518630093139525632 |
| 15 | 782782183702056884765625 |
| 16 | 95860848315529046085599232 |
| 17 | 12520224284071636768582166787 |
| 18 | 1737254440584625641929018966016 |
[1,1,12,189,4864,159375,6578496,323652399, 18572378112,1216112914971,89530000000000, 7319100286183983,657910135976361984, 64494528072860946073,6847518630093139525632, 782782183702056884765625, 95860848315529046085599232, 12520224284071636768582166787, 1737254440584625641929018966016] |