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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 1 |
| 2 | 59 |
| 3 | 3481 |
| 4 | 5959 |
| 5 | 12117361 |
| 6 | 351581 |
| 7 | 344322938 |
| 8 | 995153 |
| 9 | 35509681 |
| 10 | 1223853461 |
| 11 | 117428054 |
| 12 | 58714027 |
| 13 | 2447706922 |
| 14 | 71019362 |
| 15 | 1990306 |
| 16 | 172161469 |
| 17 | 703162 |
| 18 | 24234722 |
| 19 | 11918 |
| 20 | 6962 |
| 21 | 118 |
| 22 | 2 |
[4,1,59,3481,5959,12117361,351581,344322938, 995153,35509681,1223853461,117428054,58714027, 2447706922,71019362,1990306,172161469,703162, 24234722,11918,6962,118,2] |