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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 14 |
| 5 | 31 |
| 6 | 62 |
| 7 | 127 |
| 8 | 254 |
| 9 | 511 |
| 10 | 1022 |
| 11 | 2047 |
| 12 | 4094 |
| 13 | 8191 |
| 14 | 16382 |
| 15 | 32767 |
| 16 | 65534 |
| 17 | 131071 |
| 18 | 262142 |
| 19 | 524287 |
| 20 | 1048574 |
| 21 | 2097151 |
| 22 | 4194302 |
| 23 | 8388607 |
| 24 | 16777214 |
| 25 | 33554431 |
| 26 | 67108862 |
| 27 | 134217727 |
| 28 | 268435454 |
| 29 | 536870911 |
[-1,1,2,7,14,31,62,127,254,511,1022,2047,4094, 8191,16382,32767,65534,131071,262142,524287, 1048574,2097151,4194302,8388607,16777214,33554431, 67108862,134217727,268435454,536870911] |