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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 64 |
| 2 | 144896 |
| 3 | 64797440 |
| 4 | 4844261376 |
| 5 | 137702335360 |
| 6 | 2121497167872 |
| 7 | 21421543935488 |
| 8 | 158754959097856 |
| 9 | 929001040628032 |
| 10 | 4512095107019776 |
| 11 | 18848140365420800 |
| 12 | 69517961905356800 |
[0,64,144896,64797440,4844261376,137702335360, 2121497167872,21421543935488,158754959097856, 929001040628032,4512095107019776, 18848140365420800,69517961905356800] |