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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 180 |
| 2 | 16200 |
| 3 | 972060 |
| 4 | 43750800 |
| 5 | 1575612036 |
| 6 | 47297528280 |
| 7 | 1217347592940 |
| 8 | 27425793987360 |
| 9 | 549462705652820 |
| 10 | 9912269336940648 |
| 11 | 162650331363653820 |
| 12 | 2448015194902257840 |
| 13 | 34033222209800507940 |
| 14 | 439668298578779894520 |
[1,180,16200,972060,43750800,1575612036, 47297528280,1217347592940,27425793987360, 549462705652820,9912269336940648, 162650331363653820,2448015194902257840, 34033222209800507940,439668298578779894520] |