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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 9 |
| 7 | 23 |
| 8 | 62 |
| 9 | 164 |
| 10 | 449 |
| 11 | 1263 |
| 12 | 3636 |
| 13 | 10500 |
| 14 | 30859 |
| 15 | 90895 |
| 16 | 271178 |
| 17 | 810918 |
| 18 | 2447715 |
| 19 | 7406439 |
| 20 | 22589066 |
| 21 | 68974940 |
| 22 | 211989119 |
| 23 | 652180385 |
| 24 | 2016872920 |
| 25 | 6242930834 |
| 26 | 19412141273 |
| 27 | 60390977831 |
| 28 | 188627507266 |
[1,1,1,2,4,9,23,62,164,449,1263,3636,10500,30859, 90895,271178,810918,2447715,7406439,22589066, 68974940,211989119,652180385,2016872920, 6242930834,19412141273,60390977831,188627507266] |