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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 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 66 |
| 6 | 209 |
| 7 | 724 |
| 8 | 2722 |
| 9 | 11054 |
| 10 | 48221 |
| 11 | 224549 |
| 12 | 1109099 |
| 13 | 5778542 |
| 14 | 31599830 |
| 15 | 180605495 |
| 16 | 1074867618 |
| 17 | 6641877098 |
| 18 | 42500291654 |
| 19 | 280917956734 |
| 20 | 1913770121847 |
| 21 | 13412187670520 |
| 22 | 96528097452230 |
| 23 | 712332226596239 |
| 24 | 5382561715509704 |
[1,2,4,9,23,66,209,724,2722,11054,48221,224549, 1109099,5778542,31599830,180605495,1074867618, 6641877098,42500291654,280917956734,1913770121847, 13412187670520,96528097452230,712332226596239, 5382561715509704] |