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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 | 2 |
| 2 | 6 |
| 3 | 20 |
| 4 | 74 |
| 5 | 274 |
| 6 | 1103 |
| 7 | 4366 |
| 8 | 18185 |
| 9 | 75130 |
| 10 | 320230 |
| 11 | 1358179 |
| 12 | 5888175 |
| 13 | 25443837 |
| 14 | 111664081 |
| 15 | 489304865 |
| 16 | 2168190791 |
| 17 | 9601100796 |
| 18 | 42882613069 |
| 19 | 191466467335 |
| 20 | 860762279600 |
| 21 | 3869278985555 |
| 22 | 17489846419136 |
| 23 | 79063930975662 |
| 24 | 359042915610462 |
| 25 | 1630838121006658 |
| 26 | 7435489235481713 |
| 27 | 33912055201761025 |
[1,2,6,20,74,274,1103,4366,18185,75130,320230, 1358179,5888175,25443837,111664081,489304865, 2168190791,9601100796,42882613069,191466467335, 860762279600,3869278985555,17489846419136, 79063930975662,359042915610462,1630838121006658, 7435489235481713,33912055201761025] |