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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 14 |
| 6 | 34 |
| 7 | 83 |
| 8 | 205 |
| 9 | 516 |
| 10 | 1317 |
| 11 | 3396 |
| 12 | 8848 |
| 13 | 23253 |
| 14 | 61570 |
| 15 | 164094 |
| 16 | 439860 |
| 17 | 1185086 |
| 18 | 3207477 |
| 19 | 8716726 |
| 20 | 23776459 |
| 21 | 65072379 |
| 22 | 178637758 |
| 23 | 491772915 |
| 24 | 1357288318 |
| 25 | 3754989329 |
| 26 | 10411112464 |
| 27 | 28924678247 |
| 28 | 80512118330 |
| 29 | 224501827180 |
[1,1,1,3,6,14,34,83,205,516,1317,3396,8848,23253, 61570,164094,439860,1185086,3207477,8716726, 23776459,65072379,178637758,491772915,1357288318, 3754989329,10411112464,28924678247,80512118330, 224501827180] |