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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 | 12 |
| 4 | 43 |
| 5 | 134 |
| 6 | 448 |
| 7 | 1387 |
| 8 | 4347 |
| 9 | 13128 |
| 10 | 39350 |
| 11 | 115285 |
| 12 | 334179 |
| 13 | 952512 |
| 14 | 2684714 |
| 15 | 7468402 |
| 16 | 20556838 |
| 17 | 55963935 |
| 18 | 150896053 |
| 19 | 402999801 |
| 20 | 1066962557 |
| 21 | 2801089402 |
| 22 | 7295920768 |
| 23 | 18859954024 |
| 24 | 48404773852 |
| 25 | 123381167011 |
| 26 | 312438704848 |
| 27 | 786231143489 |
| 28 | 1966628476977 |
[1,1,4,12,43,134,448,1387,4347,13128,39350,115285, 334179,952512,2684714,7468402,20556838,55963935, 150896053,402999801,1066962557,2801089402, 7295920768,18859954024,48404773852,123381167011, 312438704848,786231143489,1966628476977] |