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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 13 |
| 6 | 34 |
| 7 | 72 |
| 8 | 137 |
| 9 | 249 |
| 10 | 524 |
| 11 | 953 |
| 12 | 1679 |
| 13 | 3106 |
| 14 | 5270 |
| 15 | 9398 |
| 16 | 15666 |
| 17 | 26284 |
| 18 | 43409 |
| 19 | 72861 |
| 20 | 115940 |
| 21 | 189476 |
| 22 | 297929 |
| 23 | 476904 |
| 24 | 743094 |
| 25 | 1174624 |
| 26 | 1782368 |
| 27 | 2787256 |
| 28 | 4196505 |
| 29 | 6413986 |
| 30 | 9645485 |
| 31 | 14553197 |
| 32 | 21483398 |
| 33 | 32243250 |
| 34 | 47165359 |
| 35 | 69606943 |
[0,1,2,7,13,34,72,137,249,524,953,1679,3106,5270, 9398,15666,26284,43409,72861,115940,189476,297929, 476904,743094,1174624,1782368,2787256,4196505, 6413986,9645485,14553197,21483398,32243250, 47165359,69606943] |