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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 22 |
| 5 | 54 |
| 6 | 212 |
| 7 | 601 |
| 8 | 2419 |
| 9 | 7359 |
| 10 | 30707 |
| 11 | 98305 |
| 12 | 415115 |
| 13 | 1386984 |
| 14 | 5944884 |
| 15 | 20395903 |
| 16 | 88370175 |
| 17 | 311007253 |
| 18 | 1357288223 |
| 19 | 4866804666 |
| 20 | 21404173960 |
| 21 | 77985019982 |
| 22 | 344771120040 |
| 23 | 1273702029750 |
| 24 | 5659467047244 |
| 25 | 21147247235020 |
| 26 | 94361020337860 |
| 27 | 356237054150967 |
| 28 | 1595259005678097 |
| 29 | 6075789783955394 |
[1,1,3,6,22,54,212,601,2419,7359,30707,98305, 415115,1386984,5944884,20395903,88370175, 311007253,1357288223,4866804666,21404173960, 77985019982,344771120040,1273702029750, 5659467047244,21147247235020,94361020337860, 356237054150967,1595259005678097,6075789783955394] |