The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 11 |
| 4 | 29 |
| 5 | 226 |
| 6 | 603 |
| 7 | 4201 |
| 8 | 10190 |
| 9 | 61830 |
| 10 | 818624 |
| 11 | 1885918 |
| 12 | 22642064 |
| 13 | 115299912 |
| 14 | 256604379 |
| 15 | 1271523594 |
| 16 | 13524323830 |
| 17 | 140047498472 |
| 18 | 302827228170 |
| 19 | 3049947866219 |
| 20 | 14117734283755 |
| 21 | 30195076020892 |
| 22 | 294858942948153 |
[2,3,11,29,226,603,4201,10190,61830,818624, 1885918,22642064,115299912,256604379,1271523594, 13524323830,140047498472,302827228170, 3049947866219,14117734283755,30195076020892, 294858942948153] |