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| n | a(n) |
|---|---|
| 3 | 5 |
| 4 | 56 |
| 5 | 465 |
| 6 | 3509 |
| 7 | 25571 |
| 8 | 184232 |
| 9 | 1325609 |
| 10 | 9567545 |
| 11 | 69387483 |
| 12 | 505915981 |
| 13 | 3708195075 |
| 14 | 27314663271 |
| 15 | 202116910415 |
| 16 | 1501769001416 |
| 17 | 11200258810265 |
| 18 | 83815491037841 |
| 19 | 629152465444715 |
| 20 | 4735907436066401 |
| 21 | 35740538971518155 |
| 22 | 270356740041089471 |
| 23 | 2049510329494271615 |
[5,56,465,3509,25571,184232,1325609,9567545, 69387483,505915981,3708195075,27314663271, 202116910415,1501769001416,11200258810265, 83815491037841,629152465444715,4735907436066401, 35740538971518155,270356740041089471, 2049510329494271615] |