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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 280 |
| 3 | 17325 |
| 4 | 1513512 |
| 5 | 162954792 |
| 6 | 20193091776 |
| 7 | 2768662192725 |
| 8 | 409716429837000 |
| 9 | 64358256798795960 |
| 10 | 10605621798062141760 |
| 11 | 1817833036248401270280 |
| 12 | 321997225483126007438400 |
| 13 | 58649494641569379926280000 |
| 14 | 10941649720331183519046796800 |
| 15 | 2084191938036600263793119045925 |
[3,9,280,17325,1513512,162954792,20193091776, 2768662192725,409716429837000,64358256798795960, 10605621798062141760,1817833036248401270280, 321997225483126007438400, 58649494641569379926280000, 10941649720331183519046796800, 2084191938036600263793119045925] |