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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 | 1 |
| 3 | 9 |
| 4 | 22 |
| 5 | 77 |
| 6 | 400 |
| 7 | 2624 |
| 8 | 20747 |
| 9 | 183544 |
| 10 | 1826374 |
| 11 | 20045348 |
| 12 | 240262047 |
| 13 | 3120641718 |
| 14 | 43665293393 |
| 15 | 654731266933 |
| 16 | 10472819759734 |
| 17 | 178001257647196 |
| 18 | 3203520381407270 |
| 19 | 60859480965537820 |
| 20 | 1217072840308660049 |
[1,1,1,9,22,77,400,2624,20747,183544,1826374, 20045348,240262047,3120641718,43665293393, 654731266933,10472819759734,178001257647196, 3203520381407270,60859480965537820, 1217072840308660049] |