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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 70 |
| 10 | 2408 |
| 11 | 61712 |
| 12 | 1377600 |
| 13 | 28663040 |
| 14 | 574139904 |
| 15 | 11259283200 |
| 16 | 218198045184 |
| 17 | 4201424145408 |
| 18 | 80643838062592 |
| 19 | 1546163834421248 |
| 20 | 29648492642205696 |
| 21 | 569064815285895168 |
| 22 | 10938353882330562560 |
| 23 | 210623966993992122368 |
| 24 | 4063570313100983795712 |
| 25 | 78558517204195934732288 |
| 26 | 1521880839150792578433024 |
[1,70,2408,61712,1377600,28663040,574139904, 11259283200,218198045184,4201424145408, 80643838062592,1546163834421248,29648492642205696, 569064815285895168,10938353882330562560, 210623966993992122368,4063570313100983795712, 78558517204195934732288,1521880839150792578433024] |