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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 | 2 |
| 4 | 3 |
| 5 | 18 |
| 6 | 114 |
| 7 | 929 |
| 8 | 6939 |
| 9 | 49405 |
| 10 | 343061 |
| 11 | 2349749 |
| 12 | 15744977 |
| 13 | 103294333 |
| 14 | 664143853 |
| 15 | 4191000242 |
| 16 | 25991406059 |
| 17 | 158554966581 |
| 18 | 952308975542 |
| 19 | 5636023020692 |
| 20 | 32891357753442 |
| 21 | 189405665405678 |
| 22 | 1076880550812387 |
[1,1,2,3,18,114,929,6939,49405,343061,2349749, 15744977,103294333,664143853,4191000242, 25991406059,158554966581,952308975542, 5636023020692,32891357753442,189405665405678, 1076880550812387] |