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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 | 4 |
| 3 | 9 |
| 4 | 34 |
| 5 | 104 |
| 6 | 382 |
| 7 | 1339 |
| 8 | 4988 |
| 9 | 18544 |
| 10 | 70850 |
| 11 | 271890 |
| 12 | 1060528 |
| 13 | 4161164 |
| 14 | 16487268 |
| 15 | 65749179 |
| 16 | 263892516 |
| 17 | 1065095388 |
| 18 | 4320942050 |
| 19 | 17607151198 |
| 20 | 72053673624 |
| 21 | 295956572780 |
| 22 | 1219869663596 |
| 23 | 5044142750342 |
| 24 | 20918319018672 |
| 25 | 86986781478112 |
| 26 | 362640691240052 |
| 27 | 1515363972162724 |
| 28 | 6346212269965344 |
[1,1,4,9,34,104,382,1339,4988,18544,70850,271890, 1060528,4161164,16487268,65749179,263892516, 1065095388,4320942050,17607151198,72053673624, 295956572780,1219869663596,5044142750342, 20918319018672,86986781478112,362640691240052, 1515363972162724,6346212269965344] |