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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 10 |
| 4 | 35 |
| 5 | 85 |
| 6 | 260 |
| 7 | 685 |
| 8 | 1985 |
| 9 | 5410 |
| 10 | 15335 |
| 11 | 42385 |
| 12 | 119060 |
| 13 | 330985 |
| 14 | 926285 |
| 15 | 2581210 |
| 16 | 7212635 |
| 17 | 20118685 |
| 18 | 56181860 |
| 19 | 156775285 |
| 20 | 437684585 |
| 21 | 1221561010 |
| 22 | 3409983935 |
| 23 | 9517788985 |
| 24 | 26567708660 |
| 25 | 74156653585 |
| 26 | 206995196885 |
| 27 | 577778464810 |
| 28 | 1612754449235 |
| 29 | 4501646773285 |
[1,5,10,35,85,260,685,1985,5410,15335,42385, 119060,330985,926285,2581210,7212635,20118685, 56181860,156775285,437684585,1221561010, 3409983935,9517788985,26567708660,74156653585, 206995196885,577778464810,1612754449235, 4501646773285] |