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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 403 |
| 3 | 40350 |
| 4 | 5223915 |
| 5 | 783353872 |
| 6 | 129141898872 |
| 7 | 22745605840236 |
| 8 | 4206489449301315 |
| 9 | 807660192541534200 |
| 10 | 159752979289765273698 |
| 11 | 32371149339259024610992 |
| 12 | 6692030708288364864188400 |
| 13 | 1406943391115083641966787200 |
| 14 | 300084647544974128326709244080 |
[1,7,403,40350,5223915,783353872,129141898872, 22745605840236,4206489449301315, 807660192541534200,159752979289765273698, 32371149339259024610992,6692030708288364864188400, 1406943391115083641966787200, 300084647544974128326709244080] |