The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 9 |
| 6 | 13 |
| 7 | 18 |
| 8 | 25 |
| 9 | 36 |
| 10 | 52 |
| 11 | 74 |
| 12 | 104 |
| 13 | 147 |
| 14 | 209 |
| 15 | 297 |
| 16 | 421 |
| 17 | 596 |
| 18 | 845 |
| 19 | 1199 |
| 20 | 1701 |
| 21 | 2411 |
| 22 | 3417 |
| 23 | 4844 |
| 24 | 6868 |
| 25 | 9738 |
| 26 | 13806 |
| 27 | 19573 |
| 28 | 27749 |
| 29 | 39342 |
| 30 | 55778 |
| 31 | 79079 |
| 32 | 112112 |
| 33 | 158944 |
| 34 | 225342 |
| 35 | 319479 |
| 36 | 452941 |
| 37 | 642152 |
| 38 | 910404 |
| 39 | 1290719 |
| 40 | 1829911 |
| 41 | 2594344 |
| 42 | 3678108 |
| 43 | 5214606 |
| 44 | 7392970 |
| 45 | 10481335 |
[1,2,3,4,6,9,13,18,25,36,52,74,104,147,209,297, 421,596,845,1199,1701,2411,3417,4844,6868,9738, 13806,19573,27749,39342,55778,79079,112112,158944, 225342,319479,452941,642152,910404,1290719, 1829911,2594344,3678108,5214606,7392970,10481335] |