The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 33 |
| 3 | 69 |
| 4 | 143 |
| 5 | 293 |
| 6 | 595 |
| 7 | 1205 |
| 8 | 2427 |
| 9 | 4885 |
| 10 | 9803 |
| 11 | 19669 |
| 12 | 39403 |
| 13 | 78933 |
| 14 | 157995 |
| 15 | 316245 |
| 16 | 632747 |
| 17 | 1266005 |
| 18 | 2532523 |
| 19 | 5066069 |
| 20 | 10133163 |
| 21 | 20268373 |
| 22 | 40538795 |
| 23 | 81081685 |
| 24 | 162167467 |
| 25 | 324343125 |
| 26 | 648694443 |
| 27 | 1297405269 |
| 28 | 2594826923 |
| 29 | 5189686613 |
[15,33,69,143,293,595,1205,2427,4885,9803,19669, 39403,78933,157995,316245,632747,1266005,2532523, 5066069,10133163,20268373,40538795,81081685, 162167467,324343125,648694443,1297405269, 2594826923,5189686613] |