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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 17 |
| 4 | 37 |
| 5 | 74 |
| 6 | 136 |
| 7 | 239 |
| 8 | 409 |
| 9 | 686 |
| 10 | 1139 |
| 11 | 1874 |
| 12 | 3066 |
| 13 | 4999 |
| 14 | 8129 |
| 15 | 13196 |
| 16 | 21398 |
| 17 | 34671 |
| 18 | 56152 |
| 19 | 90911 |
| 20 | 147155 |
| 21 | 238163 |
| 22 | 385419 |
| 23 | 623689 |
| 24 | 1009220 |
| 25 | 1633025 |
| 26 | 2642367 |
| 27 | 4275519 |
| 28 | 6918017 |
[1,6,17,37,74,136,239,409,686,1139,1874,3066,4999, 8129,13196,21398,34671,56152,90911,147155,238163, 385419,623689,1009220,1633025,2642367,4275519, 6918017] |