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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 93 |
| 4 | 1532 |
| 5 | 32240 |
| 6 | 829284 |
| 7 | 25192454 |
| 8 | 882825936 |
| 9 | 35055329832 |
| 10 | 1555548490560 |
| 11 | 76285107738312 |
| 12 | 4097094075364608 |
| 13 | 239167754501235456 |
| 14 | 15077741379436233120 |
| 15 | 1020918130521930465120 |
| 16 | 73892194568147257761024 |
| 17 | 5693112248722998479169408 |
| 18 | 465208700406183224884224000 |
[1,1,8,93,1532,32240,829284,25192454,882825936, 35055329832,1555548490560,76285107738312, 4097094075364608,239167754501235456, 15077741379436233120,1020918130521930465120, 73892194568147257761024,5693112248722998479169408, 465208700406183224884224000] |