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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 49 |
| 5 | 241 |
| 6 | 1441 |
| 7 | 10081 |
| 8 | 80641 |
| 9 | 725761 |
| 10 | 7257601 |
| 11 | 79833601 |
| 12 | 958003201 |
| 13 | 12454041601 |
| 14 | 174356582401 |
| 15 | 2615348736001 |
| 16 | 41845579776001 |
| 17 | 711374856192001 |
| 18 | 12804747411456001 |
| 19 | 243290200817664001 |
[3,3,5,13,49,241,1441,10081,80641,725761,7257601, 79833601,958003201,12454041601,174356582401, 2615348736001,41845579776001,711374856192001, 12804747411456001,243290200817664001] |