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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 | 4 |
| 3 | 11 |
| 4 | 44 |
| 5 | 133 |
| 6 | 585 |
| 7 | 2067 |
| 8 | 9140 |
| 9 | 33151 |
| 10 | 152215 |
| 11 | 588887 |
| 12 | 2707930 |
| 13 | 10600185 |
| 14 | 49739802 |
| 15 | 201846411 |
| 16 | 947313436 |
| 17 | 3868920739 |
| 18 | 18391118427 |
| 19 | 76883715861 |
| 20 | 365360718030 |
| 21 | 1533300578107 |
| 22 | 7351469941530 |
| 23 | 31365481220103 |
| 24 | 150308154051392 |
| 25 | 642895593975493 |
| 26 | 3101248214292475 |
| 27 | 13430224560698267 |
[1,1,4,11,44,133,585,2067,9140,33151,152215, 588887,2707930,10600185,49739802,201846411, 947313436,3868920739,18391118427,76883715861, 365360718030,1533300578107,7351469941530, 31365481220103,150308154051392,642895593975493, 3101248214292475,13430224560698267] |