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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 39 |
| 5 | 252 |
| 6 | 2361 |
| 7 | 32077 |
| 8 | 631058 |
| 9 | 18035534 |
| 10 | 751936149 |
| 11 | 45973362492 |
| 12 | 4144777181393 |
| 13 | 554100538432001 |
| 14 | 110435083963283354 |
| 15 | 32981178674724868365 |
[1,2,3,9,39,252,2361,32077,631058,18035534, 751936149,45973362492,4144777181393, 554100538432001,110435083963283354, 32981178674724868365] |