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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 | 3 |
| 2 | 9 |
| 3 | 18 |
| 4 | 54 |
| 5 | 162 |
| 6 | 405 |
| 7 | 1215 |
| 8 | 3645 |
| 9 | 11907 |
| 10 | 35721 |
| 11 | 107163 |
| 12 | 279936 |
| 13 | 839808 |
| 14 | 2519424 |
| 15 | 6948099 |
| 16 | 20844297 |
| 17 | 62532891 |
| 18 | 199762767 |
| 19 | 599288301 |
| 20 | 1797864903 |
| 21 | 4931772480 |
| 22 | 14795317440 |
| 23 | 44385952320 |
| 24 | 125801650638 |
| 25 | 377404951914 |
| 26 | 1132214855742 |
[1,3,9,18,54,162,405,1215,3645,11907,35721,107163, 279936,839808,2519424,6948099,20844297,62532891, 199762767,599288301,1797864903,4931772480, 14795317440,44385952320,125801650638,377404951914, 1132214855742] |