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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 7986 |
| 3 | 1950512 |
| 4 | 530931786 |
| 5 | 153580152492 |
| 6 | 46190668836656 |
| 7 | 14274134610246720 |
| 8 | 4500027052542851130 |
| 9 | 1440557297650459814996 |
| 10 | 466776334221187994469180 |
| 11 | 152741149363060061495819904 |
| 12 | 50388989722150284436348268528 |
| 13 | 16737346518387797143628281698720 |
[1,42,7986,1950512,530931786,153580152492, 46190668836656,14274134610246720, 4500027052542851130,1440557297650459814996, 466776334221187994469180, 152741149363060061495819904, 50388989722150284436348268528, 16737346518387797143628281698720] |