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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 45 |
| 4 | 287 |
| 5 | 1829 |
| 6 | 11655 |
| 7 | 74269 |
| 8 | 473263 |
| 9 | 3015765 |
| 10 | 19217303 |
| 11 | 122458061 |
| 12 | 780337215 |
| 13 | 4972528261 |
| 14 | 31686348967 |
| 15 | 201914329725 |
| 16 | 1286654912207 |
| 17 | 8198927066549 |
| 18 | 52245869817015 |
| 19 | 332925380452909 |
| 20 | 2121494183902303 |
| 21 | 13518757765504485 |
| 22 | 86145327622922183 |
[0,1,7,45,287,1829,11655,74269,473263,3015765, 19217303,122458061,780337215,4972528261, 31686348967,201914329725,1286654912207, 8198927066549,52245869817015,332925380452909, 2121494183902303,13518757765504485, 86145327622922183] |