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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 9 |
| 6 | 13 |
| 7 | 19 |
| 8 | 28 |
| 9 | 42 |
| 10 | 63 |
| 11 | 94 |
| 12 | 141 |
| 13 | 212 |
| 14 | 318 |
| 15 | 477 |
| 16 | 716 |
| 17 | 1074 |
| 18 | 1611 |
| 19 | 2417 |
| 20 | 3626 |
| 21 | 5439 |
| 22 | 8158 |
| 23 | 12237 |
[1,2,3,4,6,9,13,19,28,42,63,94,141,212,318,477, 716,1074,1611,2417,3626,5439,8158,12237] |