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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 156 |
| 4 | 2160 |
| 5 | 36720 |
| 6 | 753120 |
| 7 | 17992800 |
| 8 | 491500800 |
| 9 | 15102339840 |
| 10 | 515630707200 |
| 11 | 19365156518400 |
| 12 | 793401964185600 |
| 13 | 35214960849868800 |
| 14 | 1683239666985676800 |
| 15 | 86204093846846976000 |
| 16 | 4709107007890661376000 |
| 17 | 273324248772505362432000 |
| 18 | 16797372435596048744448000 |
[1,2,16,156,2160,36720,753120,17992800,491500800, 15102339840,515630707200,19365156518400, 793401964185600,35214960849868800, 1683239666985676800,86204093846846976000, 4709107007890661376000,273324248772505362432000, 16797372435596048744448000] |