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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 96 |
| 3 | 1280 |
| 4 | 17920 |
| 5 | 258048 |
| 6 | 3784704 |
| 7 | 56229888 |
| 8 | 843448320 |
| 9 | 12745441280 |
| 10 | 193730707456 |
| 11 | 2958796259328 |
| 12 | 45368209309696 |
| 13 | 697972450918400 |
| 14 | 10768717814169600 |
| 15 | 166556168859156480 |
| 16 | 2581620617316925440 |
| 17 | 40091049586568724480 |
| 18 | 623638549124402380800 |
| 19 | 9715632133727531827200 |
[1,8,96,1280,17920,258048,3784704,56229888, 843448320,12745441280,193730707456,2958796259328, 45368209309696,697972450918400,10768717814169600, 166556168859156480,2581620617316925440, 40091049586568724480,623638549124402380800, 9715632133727531827200] |