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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 27 |
| 3 | 235 |
| 4 | 2344 |
| 5 | 25374 |
| 6 | 289906 |
| 7 | 3441015 |
| 8 | 42017262 |
| 9 | 524418639 |
| 10 | 6660297019 |
| 11 | 85796763321 |
| 12 | 1118314903447 |
| 13 | 14722203914653 |
| 14 | 195465862293738 |
| 15 | 2614323606027841 |
| 16 | 35191188308646852 |
| 17 | 476390139438508209 |
| 18 | 6481416282265645008 |
| 19 | 88577523301166187997 |
| 20 | 1215421503348039618483 |
[1,4,27,235,2344,25374,289906,3441015,42017262, 524418639,6660297019,85796763321,1118314903447, 14722203914653,195465862293738,2614323606027841, 35191188308646852,476390139438508209, 6481416282265645008,88577523301166187997, 1215421503348039618483] |