The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 38 |
| 5 | 83 |
| 6 | 191 |
| 7 | 401 |
| 8 | 849 |
| 9 | 1740 |
| 10 | 3600 |
| 11 | 7285 |
| 12 | 14845 |
| 13 | 29938 |
| 14 | 60486 |
| 15 | 121686 |
| 16 | 245046 |
| 17 | 492090 |
| 18 | 988782 |
| 19 | 1983945 |
| 20 | 3981105 |
| 21 | 7982802 |
| 22 | 16006686 |
| 23 | 32080696 |
| 24 | 64292920 |
| 25 | 128812795 |
| 26 | 258059003 |
| 27 | 516891668 |
| 28 | 1035249788 |
| 29 | 2073167531 |
[0,1,5,14,38,83,191,401,849,1740,3600,7285,14845, 29938,60486,121686,245046,492090,988782,1983945, 3981105,7982802,16006686,32080696,64292920, 128812795,258059003,516891668,1035249788, 2073167531] |