| n | a(n) |
|---|---|
| 1 | 49 |
| 2 | 191 |
| 3 | 758 |
| 4 | 3089 |
| 5 | 12503 |
| 6 | 50912 |
| 7 | 206715 |
| 8 | 840931 |
| 9 | 3417338 |
| 10 | 13896689 |
| 11 | 56488843 |
| 12 | 229680232 |
| 13 | 933724343 |
| 14 | 3796257055 |
| 15 | 15433585490 |
| 16 | 62747204885 |
| 17 | 255100769239 |
| 18 | 1037135769960 |
| 19 | 4216531992291 |
| 20 | 17142642411675 |
| 21 | 69694499491242 |
[49,191,758,3089,12503,50912,206715,840931, 3417338,13896689,56488843,229680232,933724343, 3796257055,15433585490,62747204885,255100769239, 1037135769960,4216531992291,17142642411675, 69694499491242] |