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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 254 |
| 5 | 3062 |
| 6 | 45052 |
| 7 | 783151 |
| 8 | 15712342 |
| 9 | 357459042 |
| 10 | 9094926988 |
| 11 | 255939571048 |
| 12 | 7893741230500 |
| 13 | 264806871279676 |
| 14 | 9600056691219936 |
| 15 | 374033821840909263 |
| 16 | 15586672520501193866 |
| 17 | 691789220336675178652 |
[1,1,4,27,254,3062,45052,783151,15712342, 357459042,9094926988,255939571048,7893741230500, 264806871279676,9600056691219936, 374033821840909263,15586672520501193866, 691789220336675178652] |