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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 14 |
| 4 | 33 |
| 5 | 92 |
| 6 | 220 |
| 7 | 593 |
| 8 | 1787 |
| 9 | 5401 |
| 10 | 16954 |
| 11 | 55199 |
| 12 | 182686 |
| 13 | 613262 |
| 14 | 2081449 |
| 15 | 7111645 |
| 16 | 24412407 |
| 17 | 84069938 |
| 18 | 290115461 |
| 19 | 1002577520 |
| 20 | 3467926870 |
| 21 | 12002906321 |
| 22 | 41560738593 |
| 23 | 143945514141 |
| 24 | 498643272858 |
| 25 | 1727563137885 |
| 26 | 5985662474410 |
[3,9,14,33,92,220,593,1787,5401,16954,55199, 182686,613262,2081449,7111645,24412407,84069938, 290115461,1002577520,3467926870,12002906321, 41560738593,143945514141,498643272858, 1727563137885,5985662474410] |