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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 48 |
| 2 | 1200 |
| 3 | 31920 |
| 4 | 890820 |
| 5 | 25768512 |
| 6 | 766053288 |
| 7 | 23265871200 |
| 8 | 718834982580 |
| 9 | 22523567008800 |
| 10 | 714044153702880 |
| 11 | 22861678250567520 |
| 12 | 738191825153055000 |
| 13 | 24011251877148076800 |
| 14 | 786038700362427057600 |
| 15 | 25877760367136497398720 |
[2,48,1200,31920,890820,25768512,766053288, 23265871200,718834982580,22523567008800, 714044153702880,22861678250567520, 738191825153055000,24011251877148076800, 786038700362427057600,25877760367136497398720] |