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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 140 |
| 3 | 20 |
| 4 | 479393 |
| 5 | 219600095 |
| 6 | 4804461081 |
| 7 | 686351583 |
| 8 | 6679631931865 |
| 9 | 82080661415031 |
| 10 | 8898622841908566 |
| 11 | 174149720118385232 |
| 12 | 7290250572352382182 |
| 13 | 65315972853762054047 |
| 14 | 98713213404986046050649 |
| 15 | 11532114009920222592500432 |
| 16 | 356054521382275298405890644 |
| 17 | 28999349909865958163356878647 |
[1,18,140,20,479393,219600095,4804461081, 686351583,6679631931865,82080661415031, 8898622841908566,174149720118385232, 7290250572352382182,65315972853762054047, 98713213404986046050649, 11532114009920222592500432, 356054521382275298405890644, 28999349909865958163356878647] |