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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 7 |
| 4 | 13 |
| 5 | 17 |
| 6 | 25 |
| 7 | 34 |
| 8 | 42 |
| 9 | 54 |
| 10 | 64 |
| 11 | 78 |
| 12 | 90 |
| 13 | 107 |
| 14 | 126 |
| 15 | 140 |
| 16 | 163 |
| 17 | 178 |
| 18 | 204 |
| 19 | 222 |
| 20 | 246 |
[2,6,7,13,17,25,34,42,54,64,78,90,107,126,140,163, 178,204,222,246] |