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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 64 |
| 5 | 511 |
| 6 | 4087 |
| 7 | 65266 |
| 8 | 1043960 |
| 9 | 33294340 |
| 10 | 1064788451 |
| 11 | 67924859273 |
| 12 | 4344369237533 |
| 13 | 554246140585577 |
| 14 | 70893824733656698 |
| 15 | 18088030701247974490 |
| 16 | 4627052123343980555078 |
| 17 | 2360992279682367231113937 |
[1,2,4,16,64,511,4087,65266,1043960,33294340, 1064788451,67924859273,4344369237533, 554246140585577,70893824733656698, 18088030701247974490,4627052123343980555078, 2360992279682367231113937] |