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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 36 |
| 6 | 72 |
| 7 | 144 |
| 8 | 292 |
| 9 | 586 |
| 10 | 1172 |
| 11 | 2344 |
| 12 | 4696 |
| 13 | 9396 |
| 14 | 18792 |
| 15 | 37584 |
| 16 | 75186 |
| 17 | 150380 |
| 18 | 300764 |
| 19 | 601528 |
| 20 | 1203092 |
| 21 | 2406200 |
| 22 | 4812408 |
| 23 | 9624816 |
| 24 | 19249704 |
| 25 | 38499446 |
| 26 | 76998908 |
| 27 | 153997824 |
| 28 | 307995792 |
| 29 | 615991660 |
| 30 | 1231983352 |
| 31 | 2463966720 |
| 32 | 4927933732 |
| 33 | 9855867616 |
[1,2,4,8,18,36,72,144,292,586,1172,2344,4696,9396, 18792,37584,75186,150380,300764,601528,1203092, 2406200,4812408,9624816,19249704,38499446, 76998908,153997824,307995792,615991660,1231983352, 2463966720,4927933732,9855867616] |