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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 9 |
| 4 | 16 |
| 5 | 21 |
| 6 | 31 |
| 7 | 44 |
| 8 | 57 |
| 9 | 77 |
| 10 | 94 |
| 11 | 113 |
| 12 | 135 |
| 13 | 155 |
| 14 | 183 |
| 15 | 205 |
| 16 | 237 |
| 17 | 279 |
| 18 | 312 |
| 19 | 347 |
| 20 | 389 |
| 21 | 405 |
| 22 | 463 |
| 23 | 507 |
| 24 | 593 |
| 25 | 607 |
| 26 | 643 |
| 27 | 699 |
[3,6,9,16,21,31,44,57,77,94,113,135,155,183,205, 237,279,312,347,389,405,463,507,593,607,643,699] |