The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 3 |
| 4 | 14 |
| 5 | 18 |
| 6 | 43 |
| 7 | 78 |
| 8 | 154 |
| 9 | 305 |
| 10 | 572 |
| 11 | 1178 |
| 12 | 2185 |
| 13 | 4440 |
| 14 | 8408 |
| 15 | 16795 |
| 16 | 32212 |
| 17 | 63608 |
| 18 | 123295 |
| 19 | 241494 |
| 20 | 470486 |
| 21 | 918795 |
| 22 | 1793434 |
| 23 | 3497978 |
| 24 | 6831997 |
| 25 | 13324168 |
| 26 | 26019470 |
| 27 | 50755921 |
| 28 | 99095168 |
| 29 | 193344576 |
| 30 | 377408195 |
| 31 | 736481712 |
| 32 | 1437442548 |
| 33 | 2805273219 |
[0,4,3,14,18,43,78,154,305,572,1178,2185,4440, 8408,16795,32212,63608,123295,241494,470486, 918795,1793434,3497978,6831997,13324168,26019470, 50755921,99095168,193344576,377408195,736481712, 1437442548,2805273219] |