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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 62 |
| 4 | 24710 |
| 5 | 2076948136 |
| 6 | 9221293198653529144 |
| 7 | 170141182628636920684331812494864430896 |
[1,1,3,62,24710,2076948136,9221293198653529144, 170141182628636920684331812494864430896] |