The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 37 |
| 5 | 79 |
| 6 | 163 |
| 7 | 359 |
| 8 | 751 |
| 9 | 1593 |
| 10 | 3277 |
| 11 | 7155 |
| 12 | 14911 |
| 13 | 31697 |
| 14 | 65269 |
| 15 | 142115 |
| 16 | 295807 |
| 17 | 629805 |
| 18 | 1297801 |
| 19 | 2821249 |
| 20 | 5868145 |
| 21 | 12507295 |
| 22 | 25785595 |
| 23 | 55992063 |
| 24 | 116404999 |
| 25 | 248297225 |
| 26 | 512081677 |
| 27 | 1111033773 |
| 28 | 2308937965 |
[1,3,7,17,37,79,163,359,751,1593,3277,7155,14911, 31697,65269,142115,295807,629805,1297801,2821249, 5868145,12507295,25785595,55992063,116404999, 248297225,512081677,1111033773,2308937965] |