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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 325 |
| 5 | 5553 |
| 6 | 140103 |
| 7 | 4993445 |
| 8 | 253780210 |
| 9 | 18321882898 |
| 10 | 1882677322704 |
| 11 | 275715048156637 |
| 12 | 57570654555092091 |
| 13 | 17152947168669102772 |
| 14 | 7295365645092117304955 |
| 15 | 4430848642167010373612127 |
| 16 | 3844378527942068170940925685 |
| 17 | 4766454891141869269974497298382 |
[1,1,4,27,325,5553,140103,4993445,253780210, 18321882898,1882677322704,275715048156637, 57570654555092091,17152947168669102772, 7295365645092117304955,4430848642167010373612127, 3844378527942068170940925685, 4766454891141869269974497298382] |