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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 233 |
| 3 | 579 |
| 4 | 1373 |
| 5 | 3147 |
| 6 | 7161 |
| 7 | 16061 |
| 8 | 36193 |
| 9 | 81085 |
| 10 | 183171 |
| 11 | 413329 |
| 12 | 940933 |
| 13 | 2145151 |
| 14 | 4930245 |
| 15 | 11361373 |
| 16 | 26362361 |
| 17 | 61352875 |
| 18 | 143585559 |
| 19 | 336993507 |
| 20 | 794383691 |
| 21 | 1877216725 |
| 22 | 4450883361 |
| 23 | 10574607261 |
| 24 | 25186420645 |
| 25 | 60085979449 |
[81,233,579,1373,3147,7161,16061,36193,81085, 183171,413329,940933,2145151,4930245,11361373, 26362361,61352875,143585559,336993507,794383691, 1877216725,4450883361,10574607261,25186420645, 60085979449] |