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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 | 3 |
| 3 | 6 |
| 4 | 20 |
| 5 | 55 |
| 6 | 196 |
| 7 | 639 |
| 8 | 2327 |
| 9 | 8256 |
| 10 | 30927 |
| 11 | 115956 |
| 12 | 447505 |
| 13 | 1732101 |
| 14 | 6831117 |
| 15 | 27059859 |
| 16 | 108748569 |
| 17 | 439260818 |
| 18 | 1790252423 |
| 19 | 7336642698 |
| 20 | 30255128337 |
| 21 | 125497752360 |
| 22 | 523152712624 |
| 23 | 2190695840636 |
| 24 | 9213349157790 |
| 25 | 38891208523916 |
| 26 | 164839756761025 |
| 27 | 700926280501146 |
| 28 | 2990200877058031 |
[1,1,3,6,20,55,196,639,2327,8256,30927,115956, 447505,1732101,6831117,27059859,108748569, 439260818,1790252423,7336642698,30255128337, 125497752360,523152712624,2190695840636, 9213349157790,38891208523916,164839756761025, 700926280501146,2990200877058031] |