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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 32 |
| 5 | 64 |
| 6 | 120 |
| 7 | 218 |
| 8 | 385 |
| 9 | 668 |
| 10 | 1142 |
| 11 | 1933 |
| 12 | 3245 |
| 13 | 5415 |
| 14 | 8992 |
| 15 | 14876 |
| 16 | 24534 |
| 17 | 40362 |
| 18 | 66263 |
| 19 | 108597 |
| 20 | 177714 |
| 21 | 290454 |
| 22 | 474195 |
| 23 | 773433 |
| 24 | 1260447 |
| 25 | 2052608 |
| 26 | 3340437 |
| 27 | 5433105 |
| 28 | 8832176 |
| 29 | 14351131 |
| 30 | 23309037 |
| 31 | 37844339 |
| 32 | 61423189 |
| 33 | 99662849 |
| 34 | 161665292 |
| 35 | 262176955 |
[0,2,6,15,32,64,120,218,385,668,1142,1933,3245, 5415,8992,14876,24534,40362,66263,108597,177714, 290454,474195,773433,1260447,2052608,3340437, 5433105,8832176,14351131,23309037,37844339, 61423189,99662849,161665292,262176955] |