The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 9 |
| 4 | 17 |
| 5 | 37 |
| 6 | 77 |
| 7 | 163 |
| 8 | 343 |
| 9 | 723 |
| 10 | 1523 |
| 11 | 3209 |
| 12 | 6761 |
| 13 | 14245 |
| 14 | 30013 |
| 15 | 63235 |
| 16 | 133231 |
| 17 | 280707 |
| 18 | 591427 |
| 19 | 1246089 |
| 20 | 2625409 |
| 21 | 5531525 |
| 22 | 11654477 |
| 23 | 24555043 |
| 24 | 51735495 |
| 25 | 109002515 |
| 26 | 229659507 |
| 27 | 483874057 |
| 28 | 1019483609 |
| 29 | 2147969733 |
| 30 | 4525598973 |
[3,3,9,17,37,77,163,343,723,1523,3209,6761,14245, 30013,63235,133231,280707,591427,1246089,2625409, 5531525,11654477,24555043,51735495,109002515, 229659507,483874057,1019483609,2147969733, 4525598973] |