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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 36 |
| 4 | 192 |
| 5 | 960 |
| 6 | 4608 |
| 7 | 21504 |
| 8 | 98304 |
| 9 | 442368 |
| 10 | 1966080 |
| 11 | 8650752 |
| 12 | 37748736 |
| 13 | 163577856 |
| 14 | 704643072 |
| 15 | 3019898880 |
| 16 | 12884901888 |
| 17 | 54760833024 |
| 18 | 231928233984 |
| 19 | 979252543488 |
| 20 | 4123168604160 |
| 21 | 17317308137472 |
| 22 | 72567767433216 |
| 23 | 303465209266176 |
[6,36,192,960,4608,21504,98304,442368,1966080, 8650752,37748736,163577856,704643072,3019898880, 12884901888,54760833024,231928233984,979252543488, 4123168604160,17317308137472,72567767433216, 303465209266176] |