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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1320 |
| 3 | 146520000 |
| 4 | 1368698694000000 |
| 5 | 1075984617953259154800000 |
| 6 | 71185491858527630409715040263200000 |
| 7 | 396336553255260873925931533264339353950473200000 |
| 8 | 185705162149755607151153966767311643039842133737264420356400000 |
[1,1320,146520000,1368698694000000, 1075984617953259154800000, 71185491858527630409715040263200000, 396336553255260873925931533264339353950473200000, 18570516214975560715115396676731164303984213373726\ 4420356400000] |