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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 156 |
| 3 | 5944 |
| 4 | 425286 |
| 5 | 57811000 |
| 6 | 15246040860 |
| 7 | 7918843018760 |
| 8 | 8165859019876353 |
| 9 | 16781575370067304448 |
| 10 | 68855523432488884833408 |
| 11 | 564547878300963670909315840 |
| 12 | 9253510119618208634494942344960 |
[1,8,156,5944,425286,57811000,15246040860, 7918843018760,8165859019876353, 16781575370067304448,68855523432488884833408, 564547878300963670909315840, 9253510119618208634494942344960] |