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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 97 |
| 6 | 366 |
| 7 | 1534 |
| 8 | 7050 |
| 9 | 35167 |
| 10 | 188835 |
| 11 | 1084180 |
| 12 | 6618472 |
| 13 | 42756208 |
| 14 | 291120551 |
| 15 | 2081922515 |
| 16 | 15590248868 |
| 17 | 121920095674 |
| 18 | 993343650912 |
| 19 | 8414029179365 |
| 20 | 73953763887277 |
| 21 | 673316834487162 |
| 22 | 6340176007793060 |
| 23 | 61657373569634586 |
| 24 | 618445940056365121 |
[1,2,4,10,29,97,366,1534,7050,35167,188835, 1084180,6618472,42756208,291120551,2081922515, 15590248868,121920095674,993343650912, 8414029179365,73953763887277,673316834487162, 6340176007793060,61657373569634586, 618445940056365121] |