The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 44 |
| 3 | 90 |
| 4 | 198 |
| 5 | 370 |
| 6 | 758 |
| 7 | 1403 |
| 8 | 2824 |
| 9 | 5256 |
| 10 | 10530 |
| 11 | 19749 |
| 12 | 39516 |
| 13 | 74628 |
| 14 | 149274 |
| 15 | 283551 |
| 16 | 567120 |
| 17 | 1082440 |
| 18 | 2164898 |
| 19 | 4148594 |
| 20 | 8297206 |
| 21 | 15953598 |
| 22 | 31907214 |
| 23 | 61526960 |
| 24 | 123053938 |
| 25 | 237876562 |
| 26 | 475753142 |
| 27 | 921678867 |
| 28 | 1843357752 |
[1,13,44,90,198,370,758,1403,2824,5256,10530, 19749,39516,74628,149274,283551,567120,1082440, 2164898,4148594,8297206,15953598,31907214, 61526960,123053938,237876562,475753142,921678867, 1843357752] |