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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 82 |
| 4 | 747 |
| 5 | 6805 |
| 6 | 61992 |
| 7 | 564733 |
| 8 | 5144589 |
| 9 | 46866034 |
| 10 | 426938895 |
| 11 | 3889316089 |
| 12 | 35430783696 |
| 13 | 322766369353 |
| 14 | 2940328107873 |
| 15 | 26785719340210 |
| 16 | 244011802169763 |
| 17 | 2222891938868077 |
| 18 | 20250039251982456 |
| 19 | 184473245206710181 |
| 20 | 1680509246112374085 |
| 21 | 15309056460218076946 |
| 22 | 139462017388075066599 |
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