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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 80 |
| 3 | 1024 |
| 4 | 16640 |
| 5 | 333824 |
| 6 | 8015872 |
| 7 | 224460800 |
| 8 | 7182811136 |
| 9 | 258581463040 |
| 10 | 10343259570176 |
| 11 | 455103425282048 |
| 12 | 21844964430315520 |
| 13 | 1135938150443515904 |
| 14 | 63612536425105326080 |
| 15 | 3816752185507393306624 |
| 16 | 244272139872477466591232 |
[1,8,80,1024,16640,333824,8015872,224460800, 7182811136,258581463040,10343259570176, 455103425282048,21844964430315520, 1135938150443515904,63612536425105326080, 3816752185507393306624,244272139872477466591232] |