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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 14 |
| 5 | 24 |
| 6 | 42 |
| 7 | 74 |
| 8 | 134 |
| 9 | 246 |
| 10 | 458 |
| 11 | 856 |
| 12 | 1608 |
| 13 | 3030 |
| 14 | 5742 |
| 15 | 10936 |
| 16 | 20940 |
| 17 | 40250 |
| 18 | 77618 |
| 19 | 150020 |
| 20 | 290568 |
| 21 | 563812 |
| 22 | 1095992 |
| 23 | 2133964 |
| 24 | 4161236 |
| 25 | 8124978 |
| 26 | 15882766 |
| 27 | 31079356 |
| 28 | 60872816 |
| 29 | 119328840 |
| 30 | 234106580 |
| 31 | 459622576 |
| 32 | 902996064 |
| 33 | 1775186438 |
[1,2,4,8,14,24,42,74,134,246,458,856,1608,3030, 5742,10936,20940,40250,77618,150020,290568,563812, 1095992,2133964,4161236,8124978,15882766,31079356, 60872816,119328840,234106580,459622576,902996064, 1775186438] |