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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 86 |
| 4 | 4052 |
| 5 | 400401 |
| 6 | 71827456 |
| 7 | 21068995258 |
| 8 | 9429303819612 |
| 9 | 6105894632883407 |
| 10 | 5493030296624140330 |
| 11 | 6644655430011095138676 |
| 12 | 10523095865317003368417750 |
| 13 | 21337870239129956669159151372 |
[1,1,5,86,4052,400401,71827456,21068995258, 9429303819612,6105894632883407, 5493030296624140330,6644655430011095138676, 10523095865317003368417750, 21337870239129956669159151372] |