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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 7 |
| 3 | 12 |
| 4 | 16 |
| 5 | 23 |
| 6 | 29 |
| 7 | 38 |
| 8 | 46 |
| 9 | 57 |
| 10 | 67 |
| 11 | 80 |
| 12 | 92 |
| 13 | 107 |
| 14 | 121 |
| 15 | 138 |
| 16 | 154 |
| 17 | 173 |
| 18 | 191 |
| 19 | 212 |
| 20 | 232 |
[1,4,7,12,16,23,29,38,46,57,67,80,92,107,121,138, 154,173,191,212,232] |