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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 321 |
| 3 | 8321 |
| 4 | 158321 |
| 5 | 48158321 |
| 6 | 10548158321 |
| 7 | 38410548158321 |
| 8 | 94538410548158321 |
| 9 | 384094538410548158321 |
| 10 | 10395384094538410548158321 |
| 11 | 4608010395384094538410548158321 |
| 12 | 1351354608010395384094538410548158321 |
[1,21,321,8321,158321,48158321,10548158321, 38410548158321,94538410548158321, 384094538410548158321,10395384094538410548158321, 4608010395384094538410548158321, 1351354608010395384094538410548158321] |