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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 168 |
| 3 | 5120 |
| 4 | 190120 |
| 5 | 7939008 |
| 6 | 357713664 |
| 7 | 16993726464 |
| 8 | 839358285480 |
| 9 | 42714450658880 |
| 10 | 2225741588095168 |
| 11 | 118227198981126144 |
| 12 | 6380762273973278464 |
| 13 | 349019710593278412800 |
| 14 | 19310744204362333900800 |
| 15 | 1079054103459778710405120 |
| 16 | 60818479243449308702049960 |
[1,8,168,5120,190120,7939008,357713664, 16993726464,839358285480,42714450658880, 2225741588095168,118227198981126144, 6380762273973278464,349019710593278412800, 19310744204362333900800,1079054103459778710405120, 60818479243449308702049960] |