| n | a(n) |
|---|---|
| 0 | 13 |
| 1 | 27 |
| 2 | 40 |
| 3 | 67 |
| 4 | 107 |
| 5 | 388 |
| 6 | 2047 |
| 7 | 26999 |
| 8 | 137042 |
| 9 | 438125 |
| 10 | 575167 |
| 11 | 1013292 |
| 12 | 1588459 |
| 13 | 4190210 |
| 14 | 110533919 |
| 15 | 225258048 |
| 16 | 335791967 |
| 17 | 561050015 |
| 18 | 896841982 |
| 19 | 3251575961 |
| 20 | 17154721787 |
| 21 | 226262959192 |
| 22 | 1148469517747 |
[13,27,40,67,107,388,2047,26999,137042,438125, 575167,1013292,1588459,4190210,110533919, 225258048,335791967,561050015,896841982, 3251575961,17154721787,226262959192,1148469517747] |