The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 79 |
| 4 | 504 |
| 5 | 3514 |
| 6 | 26172 |
| 7 | 204831 |
| 8 | 1664696 |
| 9 | 13930840 |
| 10 | 119312544 |
| 11 | 1041227642 |
| 12 | 9228614836 |
| 13 | 82867255956 |
| 14 | 752405060536 |
| 15 | 6897376441167 |
| 16 | 63760133568096 |
| 17 | 593763928313128 |
| 18 | 5565678569009328 |
| 19 | 52475976165495960 |
| 20 | 497376657383374560 |
| 21 | 4736680863568248480 |
| 22 | 45304174896889357440 |
[1,3,14,79,504,3514,26172,204831,1664696,13930840, 119312544,1041227642,9228614836,82867255956, 752405060536,6897376441167,63760133568096, 593763928313128,5565678569009328, 52475976165495960,497376657383374560, 4736680863568248480,45304174896889357440] |