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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 6 |
| 7 | 11 |
| 8 | 20 |
| 9 | 36 |
| 10 | 65 |
| 11 | 118 |
| 12 | 215 |
| 13 | 389 |
| 14 | 727 |
| 15 | 1366 |
| 16 | 2565 |
| 17 | 4849 |
| 18 | 9123 |
| 19 | 17168 |
| 20 | 32629 |
| 21 | 62121 |
| 22 | 118353 |
| 23 | 226603 |
| 24 | 434512 |
| 25 | 833776 |
| 26 | 1605642 |
| 27 | 3101121 |
| 28 | 5993545 |
| 29 | 11593548 |
| 30 | 22443167 |
| 31 | 43459975 |
| 32 | 84209877 |
| 33 | 163359383 |
[1,1,1,2,4,6,11,20,36,65,118,215,389,727,1366, 2565,4849,9123,17168,32629,62121,118353,226603, 434512,833776,1605642,3101121,5993545,11593548, 22443167,43459975,84209877,163359383] |