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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 57 |
| 4 | 18544 |
| 5 | 104208775 |
| 6 | 12244640803344 |
| 7 | 36193798266945468968 |
| 8 | 3160642595226430678271332032 |
| 9 | 9374102814860736866561050257041372709 |
| 10 | 1067627008939949742128760399369846160513647927040 |
[1,2,57,18544,104208775,12244640803344, 36193798266945468968,3160642595226430678271332032, 9374102814860736866561050257041372709, 1067627008939949742128760399369846160513647927040] |