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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 726 |
| 4 | 3020778029791104 |
| 5 | 1356952251391926002664799322274919178558749179143258568252348272194427343469119954161606283821760 |
[1,1,4,726,3020778029791104, 13569522513919260026647993222749191785587491791432\ 58568252348272194427343469119954161606283821760] |