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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 14 |
| 3 | 42 |
| 4 | 113 |
| 5 | 278 |
| 6 | 646 |
| 7 | 1418 |
| 8 | 2979 |
| 9 | 6018 |
| 10 | 11752 |
| 11 | 22256 |
| 12 | 41030 |
| 13 | 73784 |
| 14 | 129748 |
| 15 | 223498 |
| 16 | 377753 |
| 17 | 627314 |
| 18 | 1024882 |
| 19 | 1649026 |
| 20 | 2615695 |
| 21 | 4093814 |
| 22 | 6327054 |
| 23 | 9663096 |
| 24 | 14593624 |
| 25 | 21807176 |
| 26 | 32260234 |
| 27 | 47270090 |
| 28 | 68637409 |
| 29 | 98804814 |
| 30 | 141063230 |
| 31 | 199815646 |
| 32 | 280916288 |
[1,4,14,42,113,278,646,1418,2979,6018,11752,22256, 41030,73784,129748,223498,377753,627314,1024882, 1649026,2615695,4093814,6327054,9663096,14593624, 21807176,32260234,47270090,68637409,98804814, 141063230,199815646,280916288] |