The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 13 |
| 4 | 1 |
| 5 | 61 |
| 6 | 1 |
| 7 | 253 |
| 8 | 1 |
| 9 | 1021 |
| 10 | 1 |
| 11 | 4093 |
| 12 | 17 |
| 13 | 16341 |
| 14 | 21 |
| 15 | 65493 |
| 16 | 21 |
| 17 | 262101 |
| 18 | 21 |
| 19 | 1048533 |
| 20 | 21 |
| 21 | 4194261 |
| 22 | 21 |
| 23 | 16777173 |
| 24 | 277 |
| 25 | 67108189 |
| 26 | 321 |
| 27 | 268434909 |
| 28 | 1 |
| 29 | 1073741821 |
| 30 | 1041 |
| 31 | 4294964693 |
| 32 | 1045 |
| 33 | 17179866589 |
| 34 | 1025 |
| 35 | 68719474173 |
| 36 | 1041 |
| 37 | 274877904341 |
| 38 | 66581 |
[1,1,1,13,1,61,1,253,1,1021,1,4093,17,16341,21, 65493,21,262101,21,1048533,21,4194261,21,16777173, 277,67108189,321,268434909,1,1073741821,1041, 4294964693,1045,17179866589,1025,68719474173,1041, 274877904341,66581] |