The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 45 |
| 6 | 87 |
| 7 | 160 |
| 8 | 290 |
| 9 | 512 |
| 10 | 889 |
| 11 | 1514 |
| 12 | 2547 |
| 13 | 4218 |
| 14 | 6909 |
| 15 | 11184 |
| 16 | 17926 |
| 17 | 28449 |
| 18 | 44772 |
| 19 | 69862 |
| 20 | 108205 |
| 21 | 166371 |
| 22 | 254107 |
| 23 | 385617 |
| 24 | 581729 |
| 25 | 872535 |
| 26 | 1301722 |
| 27 | 1932006 |
| 28 | 2853530 |
| 29 | 4194867 |
| 30 | 6139361 |
| 31 | 8946742 |
| 32 | 12984724 |
| 33 | 18771092 |
| 34 | 27033892 |
[1,2,5,11,23,45,87,160,290,512,889,1514,2547,4218, 6909,11184,17926,28449,44772,69862,108205,166371, 254107,385617,581729,872535,1301722,1932006, 2853530,4194867,6139361,8946742,12984724,18771092, 27033892] |