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| n | a(n) |
|---|---|
| 2 | 14 |
| 3 | 168 |
| 4 | 1792 |
| 5 | 17920 |
| 6 | 172032 |
| 7 | 1605632 |
| 8 | 14680064 |
| 9 | 132120576 |
| 10 | 1174405120 |
| 11 | 10334765056 |
| 12 | 90194313216 |
| 13 | 781684047872 |
| 14 | 6734508720128 |
| 15 | 57724360458240 |
| 16 | 492581209243648 |
| 17 | 4186940278571008 |
| 18 | 35465847065542656 |
| 19 | 299489375220137984 |
[14,168,1792,17920,172032,1605632,14680064, 132120576,1174405120,10334765056,90194313216, 781684047872,6734508720128,57724360458240, 492581209243648,4186940278571008, 35465847065542656,299489375220137984] |