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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 43 |
| 5 | 142 |
| 6 | 499 |
| 7 | 1850 |
| 8 | 7193 |
| 9 | 29186 |
| 10 | 123109 |
| 11 | 538078 |
| 12 | 2430355 |
| 13 | 11317646 |
| 14 | 54229907 |
| 15 | 266906858 |
| 16 | 1347262321 |
| 17 | 6965034370 |
| 18 | 36833528197 |
| 19 | 199037675054 |
| 20 | 1097912385851 |
| 21 | 6176578272782 |
| 22 | 35409316648435 |
| 23 | 206703355298074 |
| 24 | 1227820993510153 |
| 25 | 7416522514174082 |
[1,2,5,14,43,142,499,1850,7193,29186,123109, 538078,2430355,11317646,54229907,266906858, 1347262321,6965034370,36833528197,199037675054, 1097912385851,6176578272782,35409316648435, 206703355298074,1227820993510153,7416522514174082] |