The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 46 |
| 5 | 159 |
| 6 | 577 |
| 7 | 2147 |
| 8 | 8290 |
| 9 | 32569 |
| 10 | 130736 |
| 11 | 531085 |
| 12 | 2192274 |
| 13 | 9130703 |
| 14 | 38470771 |
| 15 | 163216207 |
| 16 | 698704886 |
| 17 | 3007633571 |
| 18 | 13038423868 |
| 19 | 56779502954 |
| 20 | 248683781581 |
| 21 | 1093309818901 |
| 22 | 4829390034282 |
| 23 | 21400874540542 |
| 24 | 95212283347723 |
| 25 | 424764491338480 |
| 26 | 1901372644973656 |
| 27 | 8531453059744208 |
[1,2,5,14,46,159,577,2147,8290,32569,130736, 531085,2192274,9130703,38470771,163216207, 698704886,3007633571,13038423868,56779502954, 248683781581,1093309818901,4829390034282, 21400874540542,95212283347723,424764491338480, 1901372644973656,8531453059744208] |