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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 8 |
| 8 | 9 |
| 9 | 10 |
| 10 | 15 |
| 11 | 31 |
| 12 | 1000 |
| 13 | 1000000000000 |
| 14 | 1000000000000000000000000000000000000 |
| 15 | 1000000000000000000000000000000000000000000 |
[0,1,2,3,4,5,8,9,10,15,31,1000,1000000000000, 1000000000000000000000000000000000000, 1000000000000000000000000000000000000000000] |