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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 18 |
| 6 | 36 |
| 7 | 72 |
| 8 | 145 |
| 9 | 291 |
| 10 | 582 |
| 11 | 1164 |
| 12 | 2329 |
| 13 | 4658 |
| 14 | 9316 |
| 15 | 18632 |
| 16 | 37264 |
| 17 | 74529 |
| 18 | 149059 |
| 19 | 298118 |
| 20 | 596236 |
| 21 | 1192472 |
| 22 | 2384944 |
| 23 | 4769888 |
| 24 | 9539777 |
| 25 | 19079555 |
| 26 | 38159110 |
| 27 | 76318220 |
| 28 | 152636440 |
| 29 | 305272880 |
| 30 | 610545760 |
| 31 | 1221091520 |
| 32 | 2442183041 |
[0,1,2,4,9,18,36,72,145,291,582,1164,2329,4658, 9316,18632,37264,74529,149059,298118,596236, 1192472,2384944,4769888,9539777,19079555,38159110, 76318220,152636440,305272880,610545760,1221091520, 2442183041] |