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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 13 |
| 4 | 18 |
| 5 | 38 |
| 6 | 63 |
| 7 | 113 |
| 8 | 188 |
| 9 | 338 |
| 10 | 563 |
| 11 | 1013 |
| 12 | 1688 |
| 13 | 3038 |
| 14 | 5063 |
| 15 | 9113 |
| 16 | 15188 |
| 17 | 27338 |
| 18 | 45563 |
| 19 | 82013 |
| 20 | 136688 |
| 21 | 246038 |
| 22 | 410063 |
| 23 | 738113 |
| 24 | 1230188 |
| 25 | 2214338 |
| 26 | 3690563 |
| 27 | 6643013 |
| 28 | 11071688 |
| 29 | 19929038 |
| 30 | 33215063 |
| 31 | 59787113 |
| 32 | 99645188 |
| 33 | 179361338 |
| 34 | 298935563 |
| 35 | 538084013 |
| 36 | 896806688 |
[4,6,13,18,38,63,113,188,338,563,1013,1688,3038, 5063,9113,15188,27338,45563,82013,136688,246038, 410063,738113,1230188,2214338,3690563,6643013, 11071688,19929038,33215063,59787113,99645188, 179361338,298935563,538084013,896806688] |