The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 11 |
| 5 | 21 |
| 6 | 39 |
| 7 | 67 |
| 8 | 147 |
| 9 | 309 |
| 10 | 589 |
| 11 | 1469 |
| 12 | 3413 |
| 13 | 7053 |
| 14 | 19373 |
| 15 | 48533 |
| 16 | 106773 |
| 17 | 316213 |
| 18 | 841093 |
| 19 | 1947653 |
| 20 | 6136453 |
| 21 | 17158933 |
| 22 | 41503253 |
| 23 | 137845653 |
| 24 | 402385173 |
| 25 | 1010993173 |
| 26 | 3515895573 |
| 27 | 10658462613 |
| 28 | 27699486613 |
| 29 | 100341656213 |
| 30 | 314618667413 |
| 31 | 842890411413 |
[1,2,4,7,11,21,39,67,147,309,589,1469,3413,7053, 19373,48533,106773,316213,841093,1947653,6136453, 17158933,41503253,137845653,402385173,1010993173, 3515895573,10658462613,27699486613,100341656213, 314618667413,842890411413] |