The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 9 |
| 5 | 12 |
| 6 | 15 |
| 7 | 20 |
| 8 | 28 |
| 9 | 40 |
| 10 | 59 |
| 11 | 86 |
| 12 | 121 |
| 13 | 169 |
| 14 | 235 |
| 15 | 326 |
| 16 | 458 |
| 17 | 649 |
| 18 | 919 |
| 19 | 1301 |
| 20 | 1837 |
| 21 | 2582 |
| 22 | 3627 |
| 23 | 5101 |
| 24 | 7179 |
| 25 | 10118 |
| 26 | 14272 |
| 27 | 20120 |
| 28 | 28349 |
| 29 | 39930 |
| 30 | 56221 |
| 31 | 79165 |
| 32 | 111509 |
| 33 | 157091 |
| 34 | 221325 |
| 35 | 311830 |
| 36 | 439291 |
| 37 | 618791 |
| 38 | 871621 |
| 39 | 1227752 |
| 40 | 1729447 |
| 41 | 2436267 |
| 42 | 3432010 |
[1,2,4,6,9,12,15,20,28,40,59,86,121,169,235,326, 458,649,919,1301,1837,2582,3627,5101,7179,10118, 14272,20120,28349,39930,56221,79165,111509,157091, 221325,311830,439291,618791,871621,1227752, 1729447,2436267,3432010] |