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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 66 |
| 3 | 795 |
| 4 | 7049 |
| 5 | 57848 |
| 6 | 510090 |
| 7 | 4734774 |
| 8 | 43171729 |
| 9 | 376434884 |
| 10 | 3124298256 |
| 11 | 24853892199 |
| 12 | 190903317068 |
| 13 | 1420264620170 |
| 14 | 10242847733797 |
[21,66,795,7049,57848,510090,4734774,43171729, 376434884,3124298256,24853892199,190903317068, 1420264620170,10242847733797] |