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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 140 |
| 2 | 2744420 |
| 3 | 20670535451567121260 |
| 4 | 8831921094058107711185956797335984862612406515067837739780 |
[5,140,2744420,20670535451567121260, 88319210940581077111859567973359848626124065150678\ 37739780] |