The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 10 |
| 8 | 12 |
| 9 | 13 |
| 10 | 15 |
| 11 | 20 |
| 12 | 26 |
| 13 | 30 |
| 14 | 39 |
| 15 | 52 |
| 16 | 60 |
| 17 | 65 |
| 18 | 78 |
| 19 | 130 |
| 20 | 156 |
| 21 | 195 |
| 22 | 260 |
| 23 | 390 |
| 24 | 780 |
[1,2,3,4,5,6,10,12,13,15,20,26,30,39,52,60,65,78, 130,156,195,260,390,780] |