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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 35 |
| 5 | 127 |
| 6 | 474 |
| 7 | 1810 |
| 8 | 7043 |
| 9 | 27839 |
| 10 | 111503 |
| 11 | 451640 |
| 12 | 1847032 |
| 13 | 7616692 |
| 14 | 31637664 |
| 15 | 132252886 |
| 16 | 555967283 |
| 17 | 2348920207 |
| 18 | 9968617393 |
| 19 | 42477135370 |
| 20 | 181661283779 |
| 21 | 779492777031 |
| 22 | 3354893322350 |
| 23 | 14479454240492 |
| 24 | 62652100034380 |
[1,1,3,10,35,127,474,1810,7043,27839,111503, 451640,1847032,7616692,31637664,132252886, 555967283,2348920207,9968617393,42477135370, 181661283779,779492777031,3354893322350, 14479454240492,62652100034380] |