The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | 7 |
| 4 | 17 |
| 5 | 39 |
| 6 | 65 |
| 7 | 135 |
| 8 | 257 |
| 9 | 519 |
| 10 | 1025 |
| 11 | 2055 |
| 12 | 4097 |
| 13 | 8199 |
| 14 | 16385 |
| 15 | 32775 |
| 16 | 65537 |
| 17 | 131079 |
| 18 | 262145 |
| 19 | 524295 |
| 20 | 1048577 |
| 21 | 2097159 |
| 22 | 4194305 |
| 23 | 8388615 |
| 24 | 16777217 |
| 25 | 33554439 |
| 26 | 67108865 |
| 27 | 134217735 |
| 28 | 268435457 |
| 29 | 536870919 |
| 30 | 1073741825 |
| 31 | 2147483655 |
| 32 | 4294967297 |
| 33 | 8589934599 |
[1,3,1,7,17,39,65,135,257,519,1025,2055,4097,8199, 16385,32775,65537,131079,262145,524295,1048577, 2097159,4194305,8388615,16777217,33554439, 67108865,134217735,268435457,536870919,1073741825, 2147483655,4294967297,8589934599] |