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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 789 |
| 3 | 9645 |
| 4 | 190943 |
| 5 | 3804661 |
| 6 | 68406015 |
| 7 | 1296880337 |
| 8 | 24467737897 |
| 9 | 457692634063 |
| 10 | 8608718745329 |
| 11 | 161762366006125 |
| 12 | 3037600586563709 |
| 13 | 57071758962259963 |
| 14 | 1072139556077836073 |
| 15 | 20140121314504297621 |
| 16 | 378351575243122525707 |
[21,789,9645,190943,3804661,68406015,1296880337, 24467737897,457692634063,8608718745329, 161762366006125,3037600586563709, 57071758962259963,1072139556077836073, 20140121314504297621,378351575243122525707] |