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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 16 |
| 6 | 20 |
| 7 | 21 |
| 8 | 40 |
| 9 | 45 |
| 10 | 47 |
| 11 | 52 |
| 12 | 64 |
| 13 | 67 |
| 14 | 71 |
| 15 | 72 |
| 16 | 74 |
| 17 | 88 |
[0,4,6,8,16,20,21,40,45,47,52,64,67,71,72,74,88] |