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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 40 |
| 6 | 116 |
| 7 | 200 |
| 8 | 444 |
| 9 | 760 |
| 10 | 2160 |
| 11 | 4872 |
| 12 | 11932 |
| 13 | 29252 |
| 14 | 71708 |
| 15 | 191356 |
| 16 | 536908 |
| 17 | 1607592 |
| 18 | 5184252 |
| 19 | 17331516 |
| 20 | 61597568 |
| 21 | 228854684 |
| 22 | 891958912 |
[1,2,4,12,40,116,200,444,760,2160,4872,11932, 29252,71708,191356,536908,1607592,5184252, 17331516,61597568,228854684,891958912] |