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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 9 |
| 4 | 36 |
| 5 | 108 |
| 6 | 268 |
| 7 | 591 |
| 8 | 1201 |
| 9 | 2303 |
| 10 | 4232 |
| 11 | 7534 |
| 12 | 13096 |
| 13 | 22357 |
| 14 | 37649 |
| 15 | 62749 |
| 16 | 103772 |
| 17 | 170616 |
| 18 | 279300 |
| 19 | 455747 |
| 20 | 741905 |
| 21 | 1205651 |
| 22 | 1956816 |
| 23 | 3173114 |
| 24 | 5142096 |
| 25 | 8329033 |
| 26 | 13486753 |
| 27 | 21833361 |
| 28 | 35339796 |
| 29 | 57195108 |
| 30 | 92559292 |
| 31 | 149781399 |
| 32 | 242370481 |
[0,1,1,9,36,108,268,591,1201,2303,4232,7534,13096, 22357,37649,62749,103772,170616,279300,455747, 741905,1205651,1956816,3173114,5142096,8329033, 13486753,21833361,35339796,57195108,92559292, 149781399,242370481] |