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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 | 7 |
| 3 | 22 |
| 4 | 189 |
| 5 | 757 |
| 6 | 7265 |
| 7 | 33699 |
| 8 | 339315 |
| 9 | 1719471 |
| 10 | 17562449 |
| 11 | 93885393 |
| 12 | 958423704 |
| 13 | 5294453737 |
| 14 | 53749275243 |
| 15 | 303098123295 |
| 16 | 3057605672892 |
| 17 | 17472132232105 |
| 18 | 175268385351709 |
| 19 | 1010298392497549 |
| 20 | 10088889232010085 |
| 21 | 58495304591252863 |
[1,7,22,189,757,7265,33699,339315,1719471, 17562449,93885393,958423704,5294453737, 53749275243,303098123295,3057605672892, 17472132232105,175268385351709,1010298392497549, 10088889232010085,58495304591252863] |