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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1751 |
| 3 | 484582350 |
| 4 | 4855940642591941 |
| 5 | 784651415725030722439025 |
| 6 | 1224549137633779037361672006525000 |
| 7 | 12954552338378953331770652180864486570952000 |
[1,1751,484582350,4855940642591941, 784651415725030722439025, 1224549137633779037361672006525000, 12954552338378953331770652180864486570952000] |