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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 13 |
| 7 | 24 |
| 8 | 44 |
| 9 | 79 |
| 10 | 147 |
| 11 | 275 |
| 12 | 516 |
| 13 | 976 |
| 14 | 1859 |
| 15 | 3552 |
| 16 | 6810 |
| 17 | 13102 |
| 18 | 25281 |
| 19 | 48908 |
| 20 | 94819 |
| 21 | 184144 |
| 22 | 358279 |
| 23 | 698183 |
| 24 | 1362298 |
| 25 | 2661409 |
| 26 | 5204770 |
| 27 | 10189097 |
| 28 | 19964562 |
| 29 | 39151220 |
| 30 | 76835090 |
| 31 | 150897513 |
| 32 | 296542636 |
| 33 | 583115721 |
| 34 | 1147276480 |
[0,0,1,2,4,8,13,24,44,79,147,275,516,976,1859, 3552,6810,13102,25281,48908,94819,184144,358279, 698183,1362298,2661409,5204770,10189097,19964562, 39151220,76835090,150897513,296542636,583115721, 1147276480] |