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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 20 |
| 4 | 29 |
| 5 | 339 |
| 6 | 368 |
| 7 | 3283 |
| 8 | 49613 |
| 9 | 52896 |
| 10 | 102509 |
| 11 | 155405 |
| 12 | 257914 |
| 13 | 671233 |
| 14 | 929147 |
| 15 | 2529527 |
| 16 | 5988201 |
| 17 | 14505929 |
| 18 | 20494130 |
| 19 | 55494189 |
| 20 | 75988319 |
| 21 | 131482508 |
| 22 | 207470827 |
| 23 | 338953335 |
| 24 | 5291770852 |
| 25 | 42673120151 |
| 26 | 47964891003 |
| 27 | 570286921184 |
| 28 | 618251812187 |
[1,2,9,20,29,339,368,3283,49613,52896,102509, 155405,257914,671233,929147,2529527,5988201, 14505929,20494130,55494189,75988319,131482508, 207470827,338953335,5291770852,42673120151, 47964891003,570286921184,618251812187] |