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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 8 |
| 3 | 64 |
| 4 | 158 |
| 5 | 1728 |
| 6 | 5220 |
| 7 | 66256 |
| 8 | 217336 |
| 9 | 2920784 |
| 10 | 9995864 |
| 11 | 138879808 |
| 12 | 488324280 |
| 13 | 6938896320 |
| 14 | 24865974872 |
| 15 | 359129619952 |
| 16 | 1305229141238 |
| 17 | 19084811616288 |
| 18 | 70121208253128 |
| 19 | 1035266773525472 |
| 20 | 3836844883595142 |
| 21 | 57090322839615456 |
[8,8,64,158,1728,5220,66256,217336,2920784, 9995864,138879808,488324280,6938896320, 24865974872,359129619952,1305229141238, 19084811616288,70121208253128,1035266773525472, 3836844883595142,57090322839615456] |