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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 20 |
| 5 | 44 |
| 6 | 92 |
| 7 | 188 |
| 8 | 380 |
| 9 | 764 |
| 10 | 1532 |
| 11 | 3068 |
| 12 | 6140 |
| 13 | 12284 |
| 14 | 24572 |
| 15 | 49148 |
| 16 | 98300 |
| 17 | 196604 |
| 18 | 393212 |
| 19 | 786428 |
| 20 | 1572860 |
| 21 | 3145724 |
| 22 | 6291452 |
| 23 | 12582908 |
| 24 | 25165820 |
| 25 | 50331644 |
| 26 | 100663292 |
| 27 | 201326588 |
| 28 | 402653180 |
| 29 | 805306364 |
| 30 | 1610612732 |
| 31 | 3221225468 |
| 32 | 6442450940 |
| 33 | 12884901884 |
[0,1,2,8,20,44,92,188,380,764,1532,3068,6140, 12284,24572,49148,98300,196604,393212,786428, 1572860,3145724,6291452,12582908,25165820, 50331644,100663292,201326588,402653180,805306364, 1610612732,3221225468,6442450940,12884901884] |