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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 47 |
| 6 | 95 |
| 7 | 191 |
| 8 | 383 |
| 9 | 767 |
| 10 | 1535 |
| 11 | 3071 |
| 12 | 6143 |
| 13 | 12287 |
| 14 | 24575 |
| 15 | 49151 |
| 16 | 98303 |
[0,2,5,11,23,47,95,191,383,767,1535,3071,6143, 12287,24575,49151,98303] |