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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 36 |
| 6 | 160 |
| 7 | 848 |
| 8 | 5792 |
| 9 | 41712 |
| 10 | 338688 |
| 11 | 2902464 |
| 12 | 30968064 |
| 13 | 346316544 |
| 14 | 4034119680 |
| 15 | 48892557312 |
| 16 | 707976364032 |
[2,4,8,36,160,848,5792,41712,338688,2902464, 30968064,346316544,4034119680,48892557312, 707976364032] |