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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 24 |
| 5 | 58 |
| 6 | 140 |
| 7 | 340 |
| 8 | 828 |
| 9 | 2020 |
| 10 | 4934 |
| 11 | 12068 |
| 12 | 29556 |
| 13 | 72468 |
| 14 | 177846 |
| 15 | 436788 |
| 16 | 1073438 |
| 17 | 2576072 |
[1,2,4,10,24,58,140,340,828,2020,4934,12068,29556, 72468,177846,436788,1073438,2576072] |