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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 9 |
| 7 | 12 |
| 8 | 15 |
| 9 | 19 |
| 10 | 25 |
| 11 | 28 |
| 12 | 33 |
| 13 | 40 |
| 14 | 49 |
| 15 | 53 |
| 16 | 60 |
| 17 | 69 |
| 18 | 81 |
| 19 | 86 |
| 20 | 95 |
[0,1,2,4,6,9,12,15,19,25,28,33,40,49,53,60,69,81, 86,95] |