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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 18 |
| 6 | 43 |
| 7 | 88 |
| 8 | 162 |
| 9 | 298 |
| 10 | 583 |
| 11 | 1188 |
| 12 | 2402 |
| 13 | 4722 |
| 14 | 9123 |
| 15 | 17648 |
| 16 | 34463 |
| 17 | 67632 |
| 18 | 132382 |
| 19 | 257748 |
| 20 | 500244 |
| 21 | 970790 |
| 22 | 1885815 |
| 23 | 3663816 |
| 24 | 7110990 |
| 25 | 13783264 |
| 26 | 26692422 |
| 27 | 51672484 |
| 28 | 100007876 |
| 29 | 193487262 |
| 30 | 374149235 |
| 31 | 723110880 |
| 32 | 1396927383 |
| 33 | 2697694410 |
| 34 | 5208058825 |
[1,2,3,4,7,18,43,88,162,298,583,1188,2402,4722, 9123,17648,34463,67632,132382,257748,500244, 970790,1885815,3663816,7110990,13783264,26692422, 51672484,100007876,193487262,374149235,723110880, 1396927383,2697694410,5208058825] |