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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 10 |
| 7 | 13 |
| 8 | 16 |
| 9 | 19 |
| 10 | 22 |
| 11 | 26 |
| 12 | 30 |
| 13 | 34 |
| 14 | 38 |
| 15 | 42 |
| 16 | 46 |
| 17 | 50 |
| 18 | 54 |
[0,1,3,5,7,10,13,16,19,22,26,30,34,38,42,46,50,54] |