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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 12840 |
| 3 | 87852626 |
| 4 | 2227156082842 |
| 5 | 148049849095504726 |
| 6 | 21183598567292002167082 |
| 7 | 5737167377815628378510929822 |
| 8 | 2685975192008614716088213333413834 |
| 9 | 2031667423243870021802621888823332638846 |
| 10 | 2356075680798443401764258655433216618467066594 |
[1,15,12840,87852626,2227156082842, 148049849095504726,21183598567292002167082, 5737167377815628378510929822, 2685975192008614716088213333413834, 2031667423243870021802621888823332638846, 2356075680798443401764258655433216618467066594] |