The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 10 |
| 4 | 24 |
| 5 | 65 |
| 6 | 187 |
| 7 | 552 |
| 8 | 1646 |
| 9 | 4927 |
| 10 | 14769 |
| 11 | 44294 |
| 12 | 132868 |
| 13 | 398589 |
| 14 | 1195751 |
| 15 | 3587236 |
| 16 | 10761690 |
| 17 | 32285051 |
| 18 | 96855133 |
| 19 | 290565378 |
| 20 | 871696112 |
| 21 | 2615088313 |
| 22 | 7845264915 |
| 23 | 23535794720 |
| 24 | 70607384134 |
| 25 | 211822152375 |
| 26 | 635466457097 |
[3,5,10,24,65,187,552,1646,4927,14769,44294, 132868,398589,1195751,3587236,10761690,32285051, 96855133,290565378,871696112,2615088313, 7845264915,23535794720,70607384134,211822152375, 635466457097] |