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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 22500 |
| 3 | 421875000 |
| 4 | 197753906250000 |
| 5 | 2317428588867187500000 |
| 6 | 678934156894683837890625000000 |
| 7 | 4972662281943485140800476074218750000000 |
[1,30,22500,421875000,197753906250000, 2317428588867187500000, 678934156894683837890625000000, 4972662281943485140800476074218750000000] |