The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 8 |
| 6 | 20 |
| 7 | 26 |
| 8 | 31 |
| 9 | 127 |
| 10 | 532 |
| 11 | 954 |
| 12 | 2186 |
| 13 | 2524 |
| 14 | 8191 |
| 15 | 104944 |
| 16 | 131071 |
| 17 | 524287 |
| 18 | 918080 |
| 19 | 1594322 |
| 20 | 10368512 |
| 21 | 26100416 |
| 22 | 2147483647 |
| 23 | 24708617408 |
| 24 | 25316030960 |
| 25 | 35053995440 |
| 26 | 45883878740 |
[2,3,4,7,8,20,26,31,127,532,954,2186,2524,8191, 104944,131071,524287,918080,1594322,10368512, 26100416,2147483647,24708617408,25316030960, 35053995440,45883878740] |