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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 17 |
| 5 | 28 |
| 6 | 47 |
| 7 | 76 |
| 8 | 123 |
| 9 | 196 |
| 10 | 275 |
| 11 | 388 |
| 12 | 539 |
| 13 | 696 |
| 14 | 859 |
| 15 | 1026 |
| 16 | 1265 |
| 17 | 1506 |
| 18 | 1789 |
| 19 | 2142 |
| 20 | 2509 |
| 21 | 2888 |
| 22 | 3345 |
| 23 | 4342 |
| 24 | 5709 |
| 25 | 8750 |
| 26 | 18891 |
| 27 | 33590 |
| 28 | 61119 |
| 29 | 110326 |
| 30 | 187617 |
| 31 | 272854 |
| 32 | 379547 |
| 33 | 539970 |
| 34 | 743759 |
| 35 | 1108048 |
| 36 | 2100009 |
| 37 | 3303802 |
| 38 | 4971123 |
| 39 | 8675176 |
| 40 | 13467233 |
| 41 | 28784460 |
[2,5,10,17,28,47,76,123,196,275,388,539,696,859, 1026,1265,1506,1789,2142,2509,2888,3345,4342,5709, 8750,18891,33590,61119,110326,187617,272854, 379547,539970,743759,1108048,2100009,3303802, 4971123,8675176,13467233,28784460] |