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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 50 |
| 3 | 444 |
| 4 | 4349 |
| 5 | 41348 |
| 6 | 396733 |
| 7 | 3795912 |
| 8 | 36350866 |
| 9 | 348013000 |
| 10 | 3332060177 |
| 11 | 31902067752 |
| 12 | 305441725601 |
| 13 | 2924400160544 |
| 14 | 27999196885618 |
| 15 | 268073721835248 |
| 16 | 2566628109851821 |
| 17 | 24573761479828684 |
| 18 | 235277465932911917 |
| 19 | 2252625667246251996 |
| 20 | 21567396521342873618 |
[1,4,50,444,4349,41348,396733,3795912,36350866, 348013000,3332060177,31902067752,305441725601, 2924400160544,27999196885618,268073721835248, 2566628109851821,24573761479828684, 235277465932911917,2252625667246251996, 21567396521342873618] |