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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 300 |
| 3 | 12600 |
| 4 | 793800 |
| 5 | 69854400 |
| 6 | 8172964800 |
| 7 | 1225944720000 |
| 8 | 229251662640000 |
| 9 | 52269379081920000 |
| 10 | 14269540489364160000 |
| 11 | 4594792037575259520000 |
| 12 | 1723047014090722320000000 |
| 13 | 744356310087192042240000000 |
| 14 | 366967660872985676824320000000 |
[1,12,300,12600,793800,69854400,8172964800, 1225944720000,229251662640000,52269379081920000, 14269540489364160000,4594792037575259520000, 1723047014090722320000000, 744356310087192042240000000, 366967660872985676824320000000] |