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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 11 |
| 6 | 35 |
| 7 | 56 |
| 8 | 189 |
| 9 | 302 |
| 10 | 1038 |
| 11 | 1662 |
| 12 | 5797 |
| 13 | 9295 |
| 14 | 32747 |
| 15 | 52572 |
| 16 | 186615 |
| 17 | 299898 |
| 18 | 1070762 |
| 19 | 1722236 |
| 20 | 6177698 |
| 21 | 9943555 |
| 22 | 35802935 |
| 23 | 57663784 |
| 24 | 208279007 |
| 25 | 335631410 |
| 26 | 1215507450 |
| 27 | 1959644390 |
| 28 | 7113090285 |
| 29 | 11472439905 |
| 30 | 41724381765 |
| 31 | 67320086700 |
[1,1,1,2,7,11,35,56,189,302,1038,1662,5797,9295, 32747,52572,186615,299898,1070762,1722236,6177698, 9943555,35802935,57663784,208279007,335631410, 1215507450,1959644390,7113090285,11472439905, 41724381765,67320086700] |