The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 34 |
| 5 | 184 |
| 6 | 1010 |
| 7 | 5936 |
| 8 | 35770 |
| 9 | 221872 |
| 10 | 1401890 |
| 11 | 9005240 |
| 12 | 58596754 |
| 13 | 385519912 |
| 14 | 2560003442 |
| 15 | 17135913440 |
| 16 | 115500024010 |
| 17 | 783243325792 |
| 18 | 5340020544962 |
| 19 | 36581801008616 |
| 20 | 251678879996290 |
| 21 | 1738217149202584 |
| 22 | 12046997299005938 |
| 23 | 83759578272807440 |
| 24 | 584052716966420698 |
[1,2,8,34,184,1010,5936,35770,221872,1401890, 9005240,58596754,385519912,2560003442,17135913440, 115500024010,783243325792,5340020544962, 36581801008616,251678879996290,1738217149202584, 12046997299005938,83759578272807440, 584052716966420698] |