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| n | a(n) |
|---|---|
| 0 | 19 |
| 1 | 20 |
| 2 | 39 |
| 3 | 137 |
| 4 | 2642 |
| 5 | 8063 |
| 6 | 10705 |
| 7 | 18768 |
| 8 | 723889 |
| 9 | 742657 |
| 10 | 1466546 |
| 11 | 5142295 |
| 12 | 99170151 |
| 13 | 302652748 |
| 14 | 401822899 |
| 15 | 704475647 |
| 16 | 27171897485 |
| 17 | 27876373132 |
| 18 | 55048270617 |
| 19 | 193021184983 |
| 20 | 3722450785294 |
| 21 | 11360373540865 |
| 22 | 15082824326159 |
| 23 | 26443197867024 |
| 24 | 1019924343273071 |
[19,20,39,137,2642,8063,10705,18768,723889,742657, 1466546,5142295,99170151,302652748,401822899, 704475647,27171897485,27876373132,55048270617, 193021184983,3722450785294,11360373540865, 15082824326159,26443197867024,1019924343273071] |