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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 22 |
| 5 | 54 |
| 6 | 212 |
| 7 | 601 |
| 8 | 2431 |
| 9 | 7371 |
| 10 | 30743 |
| 11 | 98770 |
| 12 | 417771 |
| 13 | 1391484 |
| 14 | 5976843 |
| 15 | 20542382 |
| 16 | 89030876 |
| 17 | 312996298 |
| 18 | 1368809428 |
| 19 | 4909105143 |
| 20 | 21604671247 |
| 21 | 78696664164 |
| 22 | 348398872923 |
| 23 | 1286815907320 |
| 24 | 5723481123788 |
| 25 | 21381776944056 |
| 26 | 95505284393873 |
| 27 | 360470126684146 |
| 28 | 1615844644679052 |
| 29 | 6152234235203491 |
[1,1,3,6,22,54,212,601,2431,7371,30743,98770, 417771,1391484,5976843,20542382,89030876, 312996298,1368809428,4909105143,21604671247, 78696664164,348398872923,1286815907320, 5723481123788,21381776944056,95505284393873, 360470126684146,1615844644679052,6152234235203491] |