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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 39 |
| 5 | 158 |
| 6 | 674 |
| 7 | 2944 |
| 8 | 13191 |
| 9 | 60078 |
| 10 | 277890 |
| 11 | 1300536 |
| 12 | 6151078 |
| 13 | 29346036 |
| 14 | 141088632 |
| 15 | 682825140 |
| 16 | 3324172359 |
| 17 | 16267134462 |
| 18 | 79975707362 |
| 19 | 394833880540 |
| 20 | 1956620531762 |
| 21 | 9729300574580 |
| 22 | 48529814786620 |
| 23 | 242757311049680 |
| 24 | 1217508537475894 |
[1,3,10,39,158,674,2944,13191,60078,277890, 1300536,6151078,29346036,141088632,682825140, 3324172359,16267134462,79975707362,394833880540, 1956620531762,9729300574580,48529814786620, 242757311049680,1217508537475894] |