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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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 47 |
| 7 | 110 |
| 8 | 263 |
| 9 | 630 |
| 10 | 1525 |
| 11 | 3701 |
| 12 | 9039 |
| 13 | 22140 |
| 14 | 54460 |
| 15 | 134339 |
| 16 | 332439 |
| 17 | 824735 |
| 18 | 2051307 |
| 19 | 5113298 |
| 20 | 12773067 |
| 21 | 31968041 |
| 22 | 80152901 |
| 23 | 201297338 |
| 24 | 506324357 |
| 25 | 1275385911 |
| 26 | 3216901194 |
| 27 | 8124150323 |
| 28 | 20541362001 |
| 29 | 51994801119 |
| 30 | 131747424892 |
[1,2,4,9,20,47,110,263,630,1525,3701,9039,22140, 54460,134339,332439,824735,2051307,5113298, 12773067,31968041,80152901,201297338,506324357, 1275385911,3216901194,8124150323,20541362001, 51994801119,131747424892] |