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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 11 |
| 5 | 15 |
| 6 | 26 |
| 7 | 28 |
| 8 | 51 |
| 9 | 150 |
| 10 | 182 |
| 11 | 228 |
| 12 | 407 |
| 13 | 638 |
| 14 | 3581 |
| 15 | 4125 |
| 16 | 4983 |
| 17 | 5666 |
| 18 | 15890 |
| 19 | 27743 |
| 20 | 43362 |
| 21 | 55367 |
| 22 | 60744 |
| 23 | 73701 |
[2,3,6,11,15,26,28,51,150,182,228,407,638,3581, 4125,4983,5666,15890,27743,43362,55367,60744, 73701] |