The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 17 |
| 6 | 65 |
| 7 | 129 |
| 8 | 153 |
| 9 | 321 |
| 10 | 1889 |
| 11 | 4097 |
| 12 | 10497 |
| 13 | 11025 |
| 14 | 28161 |
| 15 | 149345 |
| 16 | 558341 |
| 17 | 1467393 |
| 18 | 75567105 |
| 19 | 299480577 |
| 20 | 344371457 |
| 21 | 677585217 |
| 22 | 788620517 |
| 23 | 1951587609 |
| 24 | 2672464025 |
| 25 | 15958182629 |
| 26 | 52002133905 |
| 27 | 187559691777 |
| 28 | 213121397657 |
[1,3,5,9,17,65,129,153,321,1889,4097,10497,11025, 28161,149345,558341,1467393,75567105,299480577, 344371457,677585217,788620517,1951587609, 2672464025,15958182629,52002133905,187559691777, 213121397657] |