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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 10 |
| 5 | 16 |
| 6 | 25 |
| 7 | 39 |
| 8 | 60 |
| 9 | 91 |
| 10 | 138 |
| 11 | 208 |
| 12 | 313 |
| 13 | 471 |
| 14 | 708 |
| 15 | 1063 |
| 16 | 1596 |
| 17 | 2395 |
| 18 | 3594 |
| 19 | 5392 |
| 20 | 8089 |
| 21 | 12135 |
| 22 | 18204 |
| 23 | 27307 |
| 24 | 40962 |
| 25 | 61444 |
| 26 | 92167 |
[1,3,6,10,16,25,39,60,91,138,208,313,471,708,1063, 1596,2395,3594,5392,8089,12135,18204,27307,40962, 61444,92167] |