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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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 31 |
| 6 | 112 |
| 7 | 466 |
| 8 | 2124 |
| 9 | 10476 |
| 10 | 55058 |
| 11 | 301632 |
| 12 | 1703989 |
| 13 | 9819215 |
| 14 | 57364723 |
| 15 | 338134486 |
| 16 | 2005132504 |
| 17 | 11937364183 |
| 18 | 71254885362 |
| 19 | 426063226936 |
| 20 | 2550552259119 |
| 21 | 15280103806730 |
| 22 | 91588103894781 |
[1,1,3,9,31,112,466,2124,10476,55058,301632, 1703989,9819215,57364723,338134486,2005132504, 11937364183,71254885362,426063226936, 2550552259119,15280103806730,91588103894781] |