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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 72 |
| 3 | 1557 |
| 4 | 36928 |
| 5 | 986550 |
| 6 | 29641608 |
| 7 | 994006209 |
| 8 | 36887753216 |
| 9 | 1502798312547 |
| 10 | 66730937637400 |
| 11 | 3209318261685690 |
| 12 | 166242143849148864 |
| 13 | 9229638177763268395 |
| 14 | 546842961612529341032 |
| 15 | 34443269219453881669425 |
[0,3,72,1557,36928,986550,29641608,994006209, 36887753216,1502798312547,66730937637400, 3209318261685690,166242143849148864, 9229638177763268395,546842961612529341032, 34443269219453881669425] |