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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 13 |
| 3 | 37 |
| 4 | 79 |
| 5 | 163 |
| 6 | 499 |
| 7 | 1279 |
| 8 | 2683 |
| 9 | 5503 |
| 10 | 11443 |
| 11 | 23977 |
| 12 | 48193 |
| 13 | 96457 |
| 14 | 194809 |
| 15 | 390739 |
| 16 | 781969 |
| 17 | 1563967 |
| 18 | 3128887 |
[7,13,37,79,163,499,1279,2683,5503,11443,23977, 48193,96457,194809,390739,781969,1563967,3128887] |