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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 44 |
| 5 | 122 |
| 6 | 292 |
| 7 | 631 |
| 8 | 1267 |
| 9 | 2411 |
| 10 | 4408 |
| 11 | 7820 |
| 12 | 13560 |
| 13 | 23109 |
| 14 | 38867 |
| 15 | 64721 |
| 16 | 106964 |
| 17 | 175782 |
| 18 | 287660 |
| 19 | 469275 |
| 20 | 763795 |
| 21 | 1241071 |
| 22 | 2014128 |
| 23 | 3265848 |
| 24 | 5292144 |
| 25 | 8571817 |
| 26 | 13879587 |
| 27 | 22468981 |
| 28 | 36368252 |
| 29 | 58859186 |
| 30 | 95251828 |
| 31 | 154138015 |
[0,1,3,13,44,122,292,631,1267,2411,4408,7820, 13560,23109,38867,64721,106964,175782,287660, 469275,763795,1241071,2014128,3265848,5292144, 8571817,13879587,22468981,36368252,58859186, 95251828,154138015] |