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A368720 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 69360 |
| 3 | 1522177267723200 |
| 4 | 391047538356893112890665992192000 |
| 5 | 6785985430272886334677590546861463643140253138288640000000 |
[1,3,69360,1522177267723200, 391047538356893112890665992192000, 67859854302728863346775905468614636431402531382886\ 40000000] |