The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 9 |
| 3 | 36 |
| 4 | 123 |
| 5 | 414 |
| 6 | 1580 |
| 7 | 5704 |
| 8 | 20162 |
| 9 | 72715 |
| 10 | 262549 |
| 11 | 944628 |
| 12 | 3399508 |
| 13 | 12242821 |
| 14 | 44087164 |
| 15 | 158739670 |
| 16 | 571576721 |
| 17 | 2058142185 |
| 18 | 7410913041 |
| 19 | 26684956759 |
| 20 | 96086522975 |
| 21 | 345986123562 |
| 22 | 1245818108353 |
| 23 | 4485910314885 |
| 24 | 16152754437159 |
[8,9,36,123,414,1580,5704,20162,72715,262549, 944628,3399508,12242821,44087164,158739670, 571576721,2058142185,7410913041,26684956759, 96086522975,345986123562,1245818108353, 4485910314885,16152754437159] |