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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 19 |
| 3 | 235 |
| 4 | 3181 |
| 5 | 44725 |
| 6 | 648439 |
| 7 | 9614329 |
| 8 | 145020445 |
| 9 | 2217212539 |
| 10 | 34269961873 |
| 11 | 534449721793 |
| 12 | 8397498847645 |
| 13 | 132785160326593 |
| 14 | 2111135363144743 |
| 15 | 33723822603109987 |
| 16 | 540949658114010583 |
| 17 | 8708952402795685879 |
| 18 | 140665766088396528829 |
| 19 | 2278642960112808284773 |
[1,1,19,235,3181,44725,648439,9614329,145020445, 2217212539,34269961873,534449721793,8397498847645, 132785160326593,2111135363144743, 33723822603109987,540949658114010583, 8708952402795685879,140665766088396528829, 2278642960112808284773] |