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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 33 |
| 3 | 660 |
| 4 | 20817 |
| 5 | 935388 |
| 6 | 56149098 |
| 7 | 4311694467 |
| 8 | 410200118577 |
| 9 | 47174279349540 |
| 10 | 6431874002292978 |
| 11 | 1023398757621960327 |
| 12 | 187566773426941146498 |
| 13 | 39164789611542644630415 |
| 14 | 9229712819952662426436507 |
| 15 | 2435069724188535096598261305 |
[1,3,33,660,20817,935388,56149098,4311694467, 410200118577,47174279349540,6431874002292978, 1023398757621960327,187566773426941146498, 39164789611542644630415,9229712819952662426436507, 2435069724188535096598261305] |