The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 18 |
| 6 | 34 |
| 7 | 61 |
| 8 | 110 |
| 9 | 198 |
| 10 | 357 |
| 11 | 642 |
| 12 | 1156 |
| 13 | 2082 |
| 14 | 3748 |
| 15 | 6746 |
| 16 | 12143 |
| 17 | 21859 |
| 18 | 39346 |
| 19 | 70823 |
| 20 | 127482 |
| 21 | 229468 |
| 22 | 413042 |
| 23 | 743477 |
| 24 | 1338258 |
| 25 | 2408865 |
| 26 | 4335958 |
| 27 | 7804725 |
| 28 | 14048506 |
| 29 | 25287310 |
| 30 | 45517159 |
| 31 | 81930887 |
| 32 | 147475597 |
| 33 | 265456074 |
[1,1,3,5,10,18,34,61,110,198,357,642,1156,2082, 3748,6746,12143,21859,39346,70823,127482,229468, 413042,743477,1338258,2408865,4335958,7804725, 14048506,25287310,45517159,81930887,147475597, 265456074] |