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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 | 4 |
| 2 | 14 |
| 3 | 44 |
| 4 | 126 |
| 5 | 338 |
| 6 | 870 |
| 7 | 2178 |
| 8 | 5338 |
| 9 | 12854 |
| 10 | 30486 |
| 11 | 71346 |
| 12 | 165004 |
| 13 | 377616 |
| 14 | 856226 |
| 15 | 1925952 |
| 16 | 4302602 |
| 17 | 9556668 |
| 18 | 21123352 |
| 19 | 46495132 |
| 20 | 101966972 |
| 21 | 222873154 |
| 22 | 485600018 |
| 23 | 1054774296 |
| 24 | 2284128920 |
| 25 | 4931542640 |
| 26 | 10616417010 |
| 27 | 22790442500 |
| 28 | 48794077242 |
| 29 | 104205354276 |
[1,4,14,44,126,338,870,2178,5338,12854,30486, 71346,165004,377616,856226,1925952,4302602, 9556668,21123352,46495132,101966972,222873154, 485600018,1054774296,2284128920,4931542640, 10616417010,22790442500,48794077242,104205354276] |