The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 17 |
| 4 | 37 |
| 5 | 139 |
| 6 | 361 |
| 7 | 1473 |
| 8 | 4361 |
| 9 | 19091 |
| 10 | 62701 |
| 11 | 291793 |
| 12 | 1044205 |
| 13 | 5129307 |
| 14 | 19748177 |
| 15 | 101817089 |
| 16 | 417787921 |
| 17 | 2250495523 |
| 18 | 9770678101 |
| 19 | 54780588561 |
| 20 | 250194150581 |
| 21 | 1455367098923 |
| 22 | 6959638411705 |
| 23 | 41888448785857 |
| 24 | 208919770666777 |
| 25 | 1298019439099059 |
[1,3,5,17,37,139,361,1473,4361,19091,62701,291793, 1044205,5129307,19748177,101817089,417787921, 2250495523,9770678101,54780588561,250194150581, 1455367098923,6959638411705,41888448785857, 208919770666777,1298019439099059] |