The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 30 |
| 5 | 61 |
| 6 | 126 |
| 7 | 253 |
| 8 | 510 |
| 9 | 1021 |
| 10 | 2034 |
| 11 | 4093 |
| 12 | 8190 |
| 13 | 16369 |
| 14 | 32766 |
| 15 | 65535 |
| 16 | 131056 |
| 17 | 262143 |
| 18 | 524271 |
| 19 | 1048444 |
| 20 | 2097135 |
| 21 | 4194175 |
| 22 | 8388492 |
| 23 | 16777075 |
| 24 | 33554363 |
| 25 | 67108683 |
| 26 | 134217655 |
| 27 | 268435318 |
| 28 | 536870783 |
| 29 | 1073741758 |
| 30 | 2147483485 |
| 31 | 4294967262 |
| 32 | 8589934397 |
[1,2,6,15,30,61,126,253,510,1021,2034,4093,8190, 16369,32766,65535,131056,262143,524271,1048444, 2097135,4194175,8388492,16777075,33554363, 67108683,134217655,268435318,536870783,1073741758, 2147483485,4294967262,8589934397] |