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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 64 |
| 3 | 3024 |
| 4 | 279841 |
| 5 | 20489472 |
| 6 | 1572836281 |
| 7 | 118704053710 |
| 8 | 8994906720801 |
| 9 | 680750019301486 |
| 10 | 51538469967056164 |
| 11 | 3901482828808418205 |
| 12 | 295352521055213734564 |
| 13 | 22358767209627320059672 |
| 14 | 1692606840605154489536964 |
[0,64,3024,279841,20489472,1572836281, 118704053710,8994906720801,680750019301486, 51538469967056164,3901482828808418205, 295352521055213734564,22358767209627320059672, 1692606840605154489536964] |