The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 12 |
| 6 | 15 |
| 7 | 21 |
| 8 | 31 |
| 9 | 48 |
| 10 | 151 |
| 11 | 723 |
| 12 | 879 |
| 13 | 1811 |
| 14 | 3444 |
| 15 | 5104 |
| 16 | 5512 |
| 17 | 5695 |
| 18 | 6723 |
| 19 | 9082 |
| 20 | 14944 |
| 21 | 15184 |
| 22 | 18512 |
| 23 | 35141 |
| 24 | 81985 |
| 25 | 123563 |
| 26 | 155203 |
| 27 | 165134 |
| 28 | 165239 |
[1,2,4,8,12,15,21,31,48,151,723,879,1811,3444, 5104,5512,5695,6723,9082,14944,15184,18512,35141, 81985,123563,155203,165134,165239] |