The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 2 |
| 6 | 4 |
| 7 | 6 |
| 8 | 6 |
| 9 | 10 |
| 10 | 14 |
| 11 | 13 |
| 12 | 26 |
| 13 | 34 |
| 14 | 24 |
| 15 | 48 |
| 16 | 72 |
| 17 | 60 |
| 18 | 120 |
| 19 | 168 |
| 20 | 168 |
| 21 | 264 |
| 22 | 396 |
| 23 | 312 |
| 24 | 624 |
| 25 | 816 |
| 26 | 816 |
| 27 | 1632 |
| 28 | 2208 |
[1,1,2,3,2,4,6,6,10,14,13,26,34,24,48,72,60,120, 168,168,264,396,312,624,816,816,1632,2208] |