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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 90 |
| 3 | 1328 |
| 4 | 24150 |
| 5 | 520272 |
| 6 | 12926004 |
| 7 | 363233600 |
| 8 | 11376760230 |
| 9 | 392615960600 |
| 10 | 14791582824876 |
| 11 | 603743206301424 |
| 12 | 26528443526357500 |
| 13 | 1248071683342913184 |
| 14 | 62576263671773466600 |
| 15 | 3330116426356595493120 |
| 16 | 187430800395881065513734 |
[1,8,90,1328,24150,520272,12926004,363233600, 11376760230,392615960600,14791582824876, 603743206301424,26528443526357500, 1248071683342913184,62576263671773466600, 3330116426356595493120,187430800395881065513734] |