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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 | 9 |
| 3 | 33 |
| 4 | 126 |
| 5 | 477 |
| 6 | 1809 |
| 7 | 6858 |
| 8 | 26001 |
| 9 | 98577 |
| 10 | 373734 |
| 11 | 1416933 |
| 12 | 5372001 |
| 13 | 20366802 |
| 14 | 77216409 |
| 15 | 292749633 |
| 16 | 1109898126 |
| 17 | 4207943277 |
| 18 | 15953524209 |
| 19 | 60484402458 |
| 20 | 229313780001 |
| 21 | 869394547377 |
| 22 | 3296124982134 |
[1,2,9,33,126,477,1809,6858,26001,98577,373734, 1416933,5372001,20366802,77216409,292749633, 1109898126,4207943277,15953524209,60484402458, 229313780001,869394547377,3296124982134] |