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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 26 |
| 4 | 85 |
| 5 | 274 |
| 6 | 981 |
| 7 | 3498 |
| 8 | 13005 |
| 9 | 48818 |
| 10 | 186193 |
| 11 | 716474 |
| 12 | 2782657 |
| 13 | 10878642 |
| 14 | 42792797 |
| 15 | 169181578 |
| 16 | 671878845 |
| 17 | 2678679362 |
| 18 | 10716700257 |
| 19 | 43007271770 |
| 20 | 173072733629 |
| 21 | 698235687858 |
| 22 | 2823329921445 |
| 23 | 11439823954666 |
| 24 | 46440711992697 |
[2,9,26,85,274,981,3498,13005,48818,186193,716474, 2782657,10878642,42792797,169181578,671878845, 2678679362,10716700257,43007271770,173072733629, 698235687858,2823329921445,11439823954666, 46440711992697] |