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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 198 |
| 3 | 31257772 |
| 4 | 119663504378704719130518 |
| 5 | 6713329439711345431716916679280868301022936622514475069583264989008212 |
[4,198,31257772,119663504378704719130518, 67133294397113454317169166792808683010229366225144\ 75069583264989008212] |