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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 160 |
| 3 | 3584 |
| 4 | 84480 |
| 5 | 2050048 |
| 6 | 50692096 |
| 7 | 1270087680 |
| 8 | 32133218304 |
| 9 | 819082035200 |
| 10 | 21002987765760 |
| 11 | 541167892561920 |
| 12 | 13999778090188800 |
| 13 | 363391162981023744 |
| 14 | 9459706464902840320 |
| 15 | 246865719056498950144 |
| 16 | 6456334894356662059008 |
| 17 | 169176689745174567321600 |
| 18 | 4440485304168581976555520 |
[8,160,3584,84480,2050048,50692096,1270087680, 32133218304,819082035200,21002987765760, 541167892561920,13999778090188800, 363391162981023744,9459706464902840320, 246865719056498950144,6456334894356662059008, 169176689745174567321600, 4440485304168581976555520] |