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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 30 |
| 6 | 56 |
| 7 | 106 |
| 8 | 202 |
| 9 | 387 |
| 10 | 740 |
| 11 | 1415 |
| 12 | 2715 |
| 13 | 5220 |
| 14 | 10056 |
| 15 | 19400 |
| 16 | 37470 |
| 17 | 72485 |
| 18 | 140420 |
| 19 | 272380 |
| 20 | 529010 |
| 21 | 1028599 |
| 22 | 2002236 |
| 23 | 3901670 |
| 24 | 7610660 |
| 25 | 14859715 |
| 26 | 29039645 |
| 27 | 56799548 |
| 28 | 111186736 |
| 29 | 217819188 |
| 30 | 427028450 |
| 31 | 837757248 |
| 32 | 1644615098 |
| 33 | 3230577843 |
[1,2,4,8,16,30,56,106,202,387,740,1415,2715,5220, 10056,19400,37470,72485,140420,272380,529010, 1028599,2002236,3901670,7610660,14859715,29039645, 56799548,111186736,217819188,427028450,837757248, 1644615098,3230577843] |