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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 37 |
| 3 | 583 |
| 4 | 13225 |
| 5 | 394681 |
| 6 | 14659537 |
| 7 | 652829857 |
| 8 | 33937422001 |
| 9 | 2018665692721 |
| 10 | 135274646371561 |
| 11 | 10087017309339433 |
| 12 | 828563190097478425 |
| 13 | 74348364577760978329 |
| 14 | 7236649495742795579809 |
| 15 | 759466703902106082652321 |
| 16 | 85492204279344776678878945 |
| 17 | 10275933748282019792253453025 |
[1,4,37,583,13225,394681,14659537,652829857, 33937422001,2018665692721,135274646371561, 10087017309339433,828563190097478425, 74348364577760978329,7236649495742795579809, 759466703902106082652321, 85492204279344776678878945, 10275933748282019792253453025] |