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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 43 |
| 3 | 133 |
| 4 | 1326 |
| 5 | 4583 |
| 6 | 28498 |
| 7 | 146315 |
| 8 | 714260 |
| 9 | 4347058 |
| 10 | 20890725 |
| 11 | 119240779 |
| 12 | 628634929 |
| 13 | 3325454178 |
| 14 | 18388632372 |
| 15 | 96170628709 |
| 16 | 526462695215 |
| 17 | 2812362664230 |
| 18 | 15095412456655 |
| 19 | 81716259964836 |
| 20 | 436545276367478 |
| 21 | 2359997178754495 |
[7,43,133,1326,4583,28498,146315,714260,4347058, 20890725,119240779,628634929,3325454178, 18388632372,96170628709,526462695215, 2812362664230,15095412456655,81716259964836, 436545276367478,2359997178754495] |