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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 16 |
| 3 | 468 |
| 4 | 18784 |
| 5 | 932030 |
| 6 | 54321840 |
| 7 | 3611129620 |
| 8 | 268687287744 |
| 9 | 22085224470873 |
| 10 | 1986091468594160 |
| 11 | 193935237759263880 |
| 12 | 20436302307290415264 |
| 13 | 2311999369405933686648 |
| 14 | 279558778132903394262032 |
[1,1,16,468,18784,932030,54321840,3611129620, 268687287744,22085224470873,1986091468594160, 193935237759263880,20436302307290415264, 2311999369405933686648,279558778132903394262032] |