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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 18 |
| 3 | 90 |
| 4 | 479 |
| 5 | 2718 |
| 6 | 16126 |
| 7 | 97885 |
| 8 | 603741 |
| 9 | 3771287 |
| 10 | 23792622 |
| 11 | 151342506 |
| 12 | 969465873 |
| 13 | 6248109573 |
[6,18,90,479,2718,16126,97885,603741,3771287, 23792622,151342506,969465873,6248109573] |