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| n | a(n) |
|---|---|
| 4 | 16 |
| 5 | 80 |
| 6 | 666 |
| 7 | 6588 |
| 8 | 80886 |
| 9 | 1146916 |
| 10 | 18583160 |
| 11 | 337808300 |
| 12 | 6812539360 |
| 13 | 150922350288 |
| 14 | 3643698427650 |
| 15 | 95221941543232 |
| 16 | 2678117152113428 |
| 17 | 80658585770586368 |
| 18 | 2590036811212597862 |
| 19 | 88333886984966359596 |
| 20 | 3188853320209605353376 |
| 21 | 121480126482182314239216 |
| 22 | 4870248707151384381179450 |
[16,80,666,6588,80886,1146916,18583160,337808300, 6812539360,150922350288,3643698427650, 95221941543232,2678117152113428,80658585770586368, 2590036811212597862,88333886984966359596, 3188853320209605353376,121480126482182314239216, 4870248707151384381179450] |