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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 | 4 |
| 3 | 15 |
| 4 | 52 |
| 5 | 195 |
| 6 | 676 |
| 7 | 2555 |
| 8 | 8976 |
| 9 | 34098 |
| 10 | 121448 |
| 11 | 463067 |
| 12 | 1669340 |
| 13 | 6384287 |
| 14 | 23251620 |
| 15 | 89157557 |
| 16 | 327523680 |
| 17 | 1258803182 |
| 18 | 4658150520 |
| 19 | 17940605163 |
| 20 | 66803546472 |
| 21 | 257777882894 |
| 22 | 965023761064 |
| 23 | 3730202020650 |
| 24 | 14029655954272 |
| 25 | 54315578806820 |
| 26 | 205120107930192 |
[1,4,15,52,195,676,2555,8976,34098,121448,463067, 1669340,6384287,23251620,89157557,327523680, 1258803182,4658150520,17940605163,66803546472, 257777882894,965023761064,3730202020650, 14029655954272,54315578806820,205120107930192] |