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| n | a(n) |
|---|---|
| 1 | 37 |
| 2 | 199 |
| 3 | 1053 |
| 4 | 5535 |
| 5 | 28861 |
| 6 | 149511 |
| 7 | 769781 |
| 8 | 3941903 |
| 9 | 20086873 |
| 10 | 101907051 |
| 11 | 514956973 |
| 12 | 2592873483 |
| 13 | 13013271697 |
| 14 | 65120894871 |
| 15 | 325014728269 |
| 16 | 1618235038823 |
| 17 | 8039558463221 |
| 18 | 39862180531911 |
| 19 | 197290335346541 |
| 20 | 974846972091527 |
[37,199,1053,5535,28861,149511,769781,3941903, 20086873,101907051,514956973,2592873483, 13013271697,65120894871,325014728269, 1618235038823,8039558463221,39862180531911, 197290335346541,974846972091527] |