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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 540 |
| 3 | 42576 |
| 4 | 3675000 |
| 5 | 334595040 |
| 6 | 31539372732 |
| 7 | 3046472028320 |
| 8 | 299666635774704 |
| 9 | 29894793786770040 |
| 10 | 3016010007220052700 |
| 11 | 307083034957464057600 |
| 12 | 31506217163866419507000 |
| 13 | 3253427167078021753747200 |
| 14 | 337821983730064508845772700 |
| 15 | 35246436592815103238009282880 |
[0,8,540,42576,3675000,334595040,31539372732, 3046472028320,299666635774704,29894793786770040, 3016010007220052700,307083034957464057600, 31506217163866419507000,3253427167078021753747200, 337821983730064508845772700, 35246436592815103238009282880] |