The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 127 |
| 4 | 509 |
| 5 | 1019 |
| 6 | 2039 |
| 7 | 4079 |
| 8 | 16384 |
| 9 | 32768 |
| 10 | 65536 |
| 11 | 131072 |
| 12 | 262144 |
| 13 | 524287 |
| 14 | 1048573 |
| 15 | 6291437 |
[1,2,127,509,1019,2039,4079,16384,32768,65536, 131072,262144,524287,1048573,6291437] |