The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 3 |
| 9 | 7 |
| 10 | 15 |
| 11 | 31 |
| 12 | 63 |
| 13 | 127 |
| 14 | 256 |
| 15 | 514 |
| 16 | 1030 |
| 17 | 2062 |
| 18 | 4126 |
| 19 | 8254 |
| 20 | 16510 |
| 21 | 33023 |
| 22 | 66049 |
| 23 | 132101 |
| 24 | 264205 |
| 25 | 528413 |
| 26 | 1056829 |
| 27 | 2113661 |
| 28 | 4227326 |
| 29 | 8454656 |
| 30 | 16909316 |
| 31 | 33818636 |
| 32 | 67637276 |
[0,0,0,0,0,0,1,3,7,15,31,63,127,256,514,1030,2062, 4126,8254,16510,33023,66049,132101,264205,528413, 1056829,2113661,4227326,8454656,16909316,33818636, 67637276] |