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| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 1200 |
| 12 | 502723 |
| 13 | 126590751 |
| 14 | 23612496545 |
| 15 | 3629560710364 |
| 16 | 489403318321789 |
| 17 | 60236078765487885 |
| 18 | 6951229492238260300 |
| 19 | 766382530059604734389 |
| 20 | 81829925127960010076736 |
[1,1200,502723,126590751,23612496545, 3629560710364,489403318321789,60236078765487885, 6951229492238260300,766382530059604734389, 81829925127960010076736] |