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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 33 |
| 2 | 594 |
| 3 | 7722 |
| 4 | 81081 |
| 5 | 729729 |
| 6 | 5837832 |
| 7 | 42532776 |
| 8 | 287096238 |
| 9 | 1818276174 |
| 10 | 10909657044 |
| 11 | 62482581252 |
| 12 | 343654196886 |
| 13 | 1824010737318 |
| 14 | 9380626649064 |
| 15 | 46903133245320 |
| 16 | 228652774570935 |
| 17 | 1089463220014455 |
| 18 | 5084161693400790 |
[1,33,594,7722,81081,729729,5837832,42532776, 287096238,1818276174,10909657044,62482581252, 343654196886,1824010737318,9380626649064, 46903133245320,228652774570935,1089463220014455, 5084161693400790] |