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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 30 |
| 5 | 31 |
| 6 | 252 |
| 7 | 508 |
| 8 | 1020 |
| 9 | 511 |
| 10 | 1535 |
| 11 | 2047 |
| 12 | 4095 |
| 13 | 8191 |
| 14 | 16383 |
| 15 | 49151 |
| 16 | 65535 |
[0,1,3,14,30,31,252,508,1020,511,1535,2047,4095, 8191,16383,49151,65535] |