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 | 31 |
| 5 | 60 |
| 6 | 124 |
| 7 | 254 |
| 8 | 510 |
| 9 | 1015 |
| 10 | 2039 |
| 11 | 4088 |
| 12 | 8184 |
| 13 | 16376 |
| 14 | 32760 |
| 15 | 65528 |
| 16 | 131064 |
| 17 | 261944 |
| 18 | 524088 |
| 19 | 1048504 |
| 20 | 2097080 |
| 21 | 4194216 |
| 22 | 8388520 |
| 23 | 16777176 |
| 24 | 33554392 |
| 25 | 67108340 |
| 26 | 134217204 |
| 27 | 268435388 |
| 28 | 536870844 |
| 29 | 1073741310 |
| 30 | 2147483134 |
| 31 | 4294967257 |
| 32 | 8589934553 |
[1,2,6,15,31,60,124,254,510,1015,2039,4088,8184, 16376,32760,65528,131064,261944,524088,1048504, 2097080,4194216,8388520,16777176,33554392, 67108340,134217204,268435388,536870844,1073741310, 2147483134,4294967257,8589934553] |