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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 39 |
| 5 | 126 |
| 6 | 477 |
| 7 | 1765 |
| 8 | 6495 |
| 9 | 24709 |
| 10 | 95128 |
| 11 | 367368 |
| 12 | 1431453 |
| 13 | 5620343 |
| 14 | 22170543 |
| 15 | 87858813 |
| 16 | 349708431 |
| 17 | 1397003136 |
| 18 | 5598513261 |
| 19 | 22502171771 |
| 20 | 90681323364 |
| 21 | 366299212873 |
| 22 | 1482827487650 |
| 23 | 6014529069540 |
| 24 | 24439715146941 |
[1,3,13,39,126,477,1765,6495,24709,95128,367368, 1431453,5620343,22170543,87858813,349708431, 1397003136,5598513261,22502171771,90681323364, 366299212873,1482827487650,6014529069540, 24439715146941] |