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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 21 |
| 6 | 65 |
| 7 | 225 |
| 8 | 1365 |
| 9 | 14625 |
| 10 | 223125 |
| 11 | 5630625 |
| 12 | 376228125 |
| 13 | 38759765625 |
| 14 | 3471767578125 |
| 15 | 934835712890625 |
| 16 | 497199051298828125 |
| 17 | 613613372156103515625 |
| 18 | 2538878964828409423828125 |
| 19 | 25280374785655551910400390625 |
| 20 | 243473923053903449878692626953125 |
| 21 | 9202204429788304689688510894775390625 |
[2,3,5,9,21,65,225,1365,14625,223125,5630625, 376228125,38759765625,3471767578125, 934835712890625,497199051298828125, 613613372156103515625,2538878964828409423828125, 25280374785655551910400390625, 243473923053903449878692626953125, 9202204429788304689688510894775390625] |