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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 80 |
| 3 | 4384 |
| 4 | 436992 |
| 5 | 70425984 |
| 6 | 16592126976 |
| 7 | 5395435991040 |
| 8 | 2312302178205696 |
| 9 | 1263775007737085952 |
| 10 | 857643638399523454976 |
| 11 | 707659940568946007474176 |
| 12 | 697634806106676807565574144 |
[1,4,80,4384,436992,70425984,16592126976, 5395435991040,2312302178205696, 1263775007737085952,857643638399523454976, 707659940568946007474176, 697634806106676807565574144] |