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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 17 |
| 3 | 91 |
| 4 | 489 |
| 5 | 2627 |
| 6 | 14113 |
| 7 | 75819 |
| 8 | 407321 |
| 9 | 2188243 |
| 10 | 11755857 |
| 11 | 63155771 |
| 12 | 339290569 |
| 13 | 1822764387 |
| 14 | 9792403073 |
| 15 | 52607544139 |
| 16 | 282622526841 |
| 17 | 1518327722483 |
| 18 | 8156883666097 |
| 19 | 43821073775451 |
| 20 | 235419136209449 |
| 21 | 1264737828598147 |
[3,17,91,489,2627,14113,75819,407321,2188243, 11755857,63155771,339290569,1822764387,9792403073, 52607544139,282622526841,1518327722483, 8156883666097,43821073775451,235419136209449, 1264737828598147] |