The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 77 |
| 4 | 464 |
| 5 | 2964 |
| 6 | 19717 |
| 7 | 135131 |
| 8 | 947549 |
| 9 | 6765642 |
| 10 | 49022225 |
| 11 | 359545750 |
| 12 | 2664127354 |
| 13 | 19913283809 |
| 14 | 149968276974 |
| 15 | 1136856855549 |
| 16 | 8668000962927 |
| 17 | 66428474900907 |
| 18 | 511414514214628 |
| 19 | 3953420853213504 |
| 20 | 30674783555852576 |
| 21 | 238808419235022293 |
| 22 | 1864869207177530320 |
[1,3,14,77,464,2964,19717,135131,947549,6765642, 49022225,359545750,2664127354,19913283809, 149968276974,1136856855549,8668000962927, 66428474900907,511414514214628,3953420853213504, 30674783555852576,238808419235022293, 1864869207177530320] |