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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 30 |
| 5 | 61 |
| 6 | 126 |
| 7 | 253 |
| 8 | 510 |
| 9 | 1009 |
| 10 | 2046 |
| 11 | 4095 |
| 12 | 8176 |
| 13 | 16383 |
| 14 | 32767 |
| 15 | 65532 |
| 16 | 131071 |
| 17 | 261903 |
| 18 | 524284 |
| 19 | 1048575 |
| 20 | 2096911 |
| 21 | 4194303 |
| 22 | 8388591 |
| 23 | 16777183 |
| 24 | 33554415 |
| 25 | 67108831 |
| 26 | 134217711 |
| 27 | 268435423 |
| 28 | 536870895 |
| 29 | 1073741791 |
| 30 | 2147483631 |
| 31 | 4294967263 |
| 32 | 8589934575 |
[1,2,6,15,30,61,126,253,510,1009,2046,4095,8176, 16383,32767,65532,131071,261903,524284,1048575, 2096911,4194303,8388591,16777183,33554415, 67108831,134217711,268435423,536870895,1073741791, 2147483631,4294967263,8589934575] |