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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 7 |
| 2 | 25 |
| 3 | 1985 |
| 4 | 14905 |
| 5 | 9006925 |
| 6 | 20012525 |
| 7 | 202749678625 |
| 8 | -3158018147375 |
| 9 | 14186901874647125 |
| 10 | -671237145329976875 |
| 11 | 2393939114315833215625 |
| 12 | -224442506249023480234375 |
| 13 | 829987864326478226455328125 |
[2,7,25,1985,14905,9006925,20012525,202749678625, -3158018147375,14186901874647125, -671237145329976875,2393939114315833215625, -224442506249023480234375, 829987864326478226455328125] |