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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 | 3 |
| 3 | 8 |
| 4 | 27 |
| 5 | 89 |
| 6 | 320 |
| 7 | 1158 |
| 8 | 4347 |
| 9 | 16510 |
| 10 | 63903 |
| 11 | 249952 |
| 12 | 989110 |
| 13 | 3947056 |
| 14 | 15878333 |
| 15 | 64296723 |
| 16 | 261931840 |
| 17 | 1072616649 |
| 18 | 4413123474 |
| 19 | 18233286270 |
| 20 | 75619434417 |
| 21 | 314696837489 |
| 22 | 1313747904446 |
| 23 | 5500152407820 |
| 24 | 23087645330262 |
| 25 | 97148591427302 |
| 26 | 409700045646219 |
| 27 | 1731398744266320 |
| 28 | 7331054076146476 |
[1,1,3,8,27,89,320,1158,4347,16510,63903,249952, 989110,3947056,15878333,64296723,261931840, 1072616649,4413123474,18233286270,75619434417, 314696837489,1313747904446,5500152407820, 23087645330262,97148591427302,409700045646219, 1731398744266320,7331054076146476] |