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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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 98 |
| 6 | 534 |
| 7 | 3414 |
| 8 | 25498 |
| 9 | 217338 |
| 10 | 2080990 |
| 11 | 22076030 |
| 12 | 256888218 |
| 13 | 3252308706 |
| 14 | 44497313158 |
| 15 | 654139144158 |
| 16 | 10281397705242 |
| 17 | 172033123244330 |
| 18 | 3052895403376110 |
| 19 | 57266799403366334 |
| 20 | 1132124282036449570 |
| 21 | 23524895818926592242 |
[1,1,2,6,22,98,534,3414,25498,217338,2080990, 22076030,256888218,3252308706,44497313158, 654139144158,10281397705242,172033123244330, 3052895403376110,57266799403366334, 1132124282036449570,23524895818926592242] |