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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 10 |
| 5 | 29 |
| 6 | 73 |
| 7 | 255 |
| 8 | 1166 |
| 9 | 5371 |
| 10 | 29682 |
| 11 | 210876 |
| 12 | 1671283 |
| 13 | 15280803 |
| 14 | 171861787 |
| 15 | 2259744342 |
| 16 | 34374508575 |
| 17 | 625277335018 |
| 18 | 13461221324518 |
| 19 | 338565697760175 |
| 20 | 10066909617112085 |
| 21 | 354314901636357736 |
| 22 | 14658961195961880848 |
[1,2,3,4,10,29,73,255,1166,5371,29682,210876, 1671283,15280803,171861787,2259744342,34374508575, 625277335018,13461221324518,338565697760175, 10066909617112085,354314901636357736, 14658961195961880848] |