The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 15 |
| 5 | 28 |
| 6 | 53 |
| 7 | 101 |
| 8 | 192 |
| 9 | 364 |
| 10 | 690 |
| 11 | 1309 |
| 12 | 2484 |
| 13 | 4713 |
| 14 | 8941 |
| 15 | 16962 |
| 16 | 32180 |
| 17 | 61052 |
| 18 | 115827 |
| 19 | 219744 |
| 20 | 416893 |
| 21 | 790921 |
| 22 | 1500520 |
| 23 | 2846756 |
| 24 | 5400806 |
| 25 | 10246297 |
| 26 | 19439064 |
| 27 | 36879393 |
| 28 | 69966825 |
| 29 | 132739618 |
| 30 | 251830868 |
| 31 | 477768336 |
| 32 | 906412247 |
| 33 | 1719626644 |
[1,2,4,8,15,28,53,101,192,364,690,1309,2484,4713, 8941,16962,32180,61052,115827,219744,416893, 790921,1500520,2846756,5400806,10246297,19439064, 36879393,69966825,132739618,251830868,477768336, 906412247,1719626644] |