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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 | 9 |
| 3 | 25 |
| 4 | 105 |
| 5 | 369 |
| 6 | 1393 |
| 7 | 5105 |
| 8 | 18937 |
| 9 | 69897 |
| 10 | 258521 |
| 11 | 955361 |
| 12 | 3531745 |
| 13 | 13054177 |
| 14 | 48254185 |
| 15 | 178365177 |
| 16 | 659309641 |
| 17 | 2437064529 |
| 18 | 9008352081 |
| 19 | 33298400977 |
| 20 | 123083978969 |
| 21 | 454966715881 |
| 22 | 1681735706553 |
| 23 | 6216355687361 |
| 24 | 22978092329921 |
[1,9,25,105,369,1393,5105,18937,69897,258521, 955361,3531745,13054177,48254185,178365177, 659309641,2437064529,9008352081,33298400977, 123083978969,454966715881,1681735706553, 6216355687361,22978092329921] |