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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 34 |
| 4 | 217 |
| 5 | 731 |
| 6 | 1743 |
| 7 | 2183 |
| 8 | 3759 |
| 9 | 21179 |
| 10 | 121179 |
| 11 | 931303 |
| 12 | 1931303 |
| 13 | 11175573 |
| 14 | 11379829 |
| 15 | 17896361 |
| 16 | 18419721 |
| 17 | 96919009 |
| 18 | 889910891 |
| 19 | 1889910891 |
| 20 | 2742368917 |
| 21 | 25741106537 |
| 22 | 110203233579 |
| 23 | 679231622473 |
| 24 | 1679231622473 |
| 25 | 7921256096487 |
[2,12,34,217,731,1743,2183,3759,21179,121179, 931303,1931303,11175573,11379829,17896361, 18419721,96919009,889910891,1889910891,2742368917, 25741106537,110203233579,679231622473, 1679231622473,7921256096487] |