The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 78 |
| 6 | 338 |
| 7 | 1058 |
| 8 | 4698 |
| 9 | 15815 |
| 10 | 71857 |
| 11 | 254131 |
| 12 | 1171908 |
| 13 | 4299343 |
| 14 | 20033275 |
| 15 | 75604044 |
| 16 | 355031655 |
| 17 | 1370157810 |
| 18 | 6473774685 |
| 19 | 25439602074 |
| 20 | 120803852290 |
| 21 | 481857921850 |
| 22 | 2297720569921 |
| 23 | 9281270433460 |
| 24 | 44411479521073 |
| 25 | 181340063616526 |
| 26 | 870286355337437 |
| 27 | 3586923172138147 |
| 28 | 17258169211072089 |
[1,1,3,7,29,78,338,1058,4698,15815,71857,254131, 1171908,4299343,20033275,75604044,355031655, 1370157810,6473774685,25439602074,120803852290, 481857921850,2297720569921,9281270433460, 44411479521073,181340063616526,870286355337437, 3586923172138147,17258169211072089] |