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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 19 |
| 5 | 37 |
| 6 | 73 |
| 7 | 143 |
| 8 | 279 |
| 9 | 548 |
| 10 | 1079 |
| 11 | 2132 |
| 12 | 4223 |
| 13 | 8384 |
| 14 | 16673 |
| 15 | 33203 |
| 16 | 66190 |
| 17 | 132055 |
| 18 | 263619 |
| 19 | 526502 |
| 20 | 1051899 |
| 21 | 2102137 |
| 22 | 4201783 |
| 23 | 8399828 |
| 24 | 16794048 |
| 25 | 33579681 |
| 26 | 67146738 |
| 27 | 134274541 |
| 28 | 268520676 |
| 29 | 536998744 |
| 30 | 1073933573 |
| 31 | 2147771272 |
| 32 | 4295398733 |
| 33 | 8590581749 |
[1,4,9,19,37,73,143,279,548,1079,2132,4223,8384, 16673,33203,66190,132055,263619,526502,1051899, 2102137,4201783,8399828,16794048,33579681, 67146738,134274541,268520676,536998744,1073933573, 2147771272,4295398733,8590581749] |