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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 1376 |
| 4 | 1211112 |
| 5 | 4131348480 |
| 6 | 49965944917500 |
| 7 | 2284546587678218240 |
| 8 | 399352031269643676301056 |
[1,6,1376,1211112,4131348480,49965944917500, 2284546587678218240,399352031269643676301056] |