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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 19 |
| 5 | 46 |
| 6 | 88 |
| 7 | 185 |
| 8 | 380 |
| 9 | 793 |
| 10 | 1589 |
| 11 | 3106 |
| 12 | 6078 |
| 13 | 12147 |
| 14 | 24534 |
| 15 | 49482 |
| 16 | 99792 |
| 17 | 201892 |
| 18 | 408478 |
[1,2,4,12,19,46,88,185,380,793,1589,3106,6078, 12147,24534,49482,99792,201892,408478] |