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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 20 |
| 6 | 55 |
| 7 | 223 |
| 8 | 761 |
| 9 | 3595 |
| 10 | 14532 |
| 11 | 77818 |
| 12 | 361605 |
| 13 | 2155525 |
| 14 | 11274781 |
| 15 | 73822175 |
| 16 | 428004750 |
| 17 | 3046519516 |
| 18 | 19348533739 |
| 19 | 148493347507 |
| 20 | 1023481273549 |
| 21 | 8412534272415 |
| 22 | 62450994058052 |
| 23 | 546699337652602 |
| 24 | 4343869829492281 |
| 25 | 40308548641909593 |
| 26 | 340994681344324137 |
[1,1,1,3,6,20,55,223,761,3595,14532,77818,361605, 2155525,11274781,73822175,428004750,3046519516, 19348533739,148493347507,1023481273549, 8412534272415,62450994058052,546699337652602, 4343869829492281,40308548641909593, 340994681344324137] |