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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 | 4 |
| 4 | 9 |
| 5 | 29 |
| 6 | 90 |
| 7 | 301 |
| 8 | 1001 |
| 9 | 3441 |
| 10 | 11934 |
| 11 | 42019 |
| 12 | 149226 |
| 13 | 534978 |
| 14 | 1931540 |
| 15 | 7020706 |
| 16 | 25662825 |
| 17 | 94288121 |
| 18 | 347993910 |
| 19 | 1289627931 |
| 20 | 4796857230 |
| 21 | 17902158534 |
| 22 | 67016296620 |
| 23 | 251577092029 |
| 24 | 946844533674 |
| 25 | 3572042403354 |
| 26 | 13505406670700 |
| 27 | 51166198378830 |
| 28 | 194214400834356 |
| 29 | 738494266832548 |
[1,1,1,4,9,29,90,301,1001,3441,11934,42019,149226, 534978,1931540,7020706,25662825,94288121, 347993910,1289627931,4796857230,17902158534, 67016296620,251577092029,946844533674, 3572042403354,13505406670700,51166198378830, 194214400834356,738494266832548] |