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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 | 6 |
| 4 | 20 |
| 5 | 51 |
| 6 | 184 |
| 7 | 552 |
| 8 | 2112 |
| 9 | 7007 |
| 10 | 27770 |
| 11 | 97954 |
| 12 | 397618 |
| 13 | 1465253 |
| 14 | 6064186 |
| 15 | 23118215 |
| 16 | 97170678 |
| 17 | 380318302 |
| 18 | 1618291003 |
| 19 | 6467714046 |
| 20 | 27801600440 |
| 21 | 113039060164 |
| 22 | 490098103728 |
| 23 | 2021518407162 |
| 24 | 8829111125199 |
| 25 | 36862439853648 |
| 26 | 162021554794771 |
| 27 | 683535234262247 |
| 28 | 3021023205814566 |
[1,1,3,6,20,51,184,552,2112,7007,27770,97954, 397618,1465253,6064186,23118215,97170678, 380318302,1618291003,6467714046,27801600440, 113039060164,490098103728,2021518407162, 8829111125199,36862439853648,162021554794771, 683535234262247,3021023205814566] |