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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 30 |
| 3 | 1108 |
| 4 | 76372 |
| 5 | 8463328 |
| 6 | 1375868768 |
| 7 | 308440047648 |
| 8 | 91189383264864 |
| 9 | 34376022491122368 |
| 10 | 16093445542120281792 |
| 11 | 9160424435706947112576 |
| 12 | 6230035512106223752576896 |
| 13 | 4989402076922846372194268160 |
| 14 | 4647526704475074504983564884992 |
[1,2,30,1108,76372,8463328,1375868768, 308440047648,91189383264864,34376022491122368, 16093445542120281792,9160424435706947112576, 6230035512106223752576896, 4989402076922846372194268160, 4647526704475074504983564884992] |