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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 1356 |
| 4 | 3978958 |
| 5 | 70252384001 |
| 6 | 5897868149018025 |
| 7 | 1951415739647747836330 |
| 8 | 2186630273077730637194339120 |
| 9 | 7330158006601231605920532966798192 |
| 10 | 66348852357002987700605359091266362631153 |
[0,5,1356,3978958,70252384001,5897868149018025, 1951415739647747836330, 2186630273077730637194339120, 7330158006601231605920532966798192, 66348852357002987700605359091266362631153] |