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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 384 |
| 4 | 5460 |
| 5 | 84816 |
| 6 | 1347396 |
| 7 | 21521184 |
| 8 | 344194740 |
| 9 | 5506552176 |
| 10 | 88102619556 |
| 11 | 1409633169984 |
| 12 | 22554096102420 |
| 13 | 360865400232336 |
| 14 | 5773845857280516 |
| 15 | 92381531540306784 |
| 16 | 1478104495968880500 |
| 17 | 23649671900884069296 |
| 18 | 378394750275931314276 |
| 19 | 6054316003862820691584 |
[6,36,384,5460,84816,1347396,21521184,344194740, 5506552176,88102619556,1409633169984, 22554096102420,360865400232336,5773845857280516, 92381531540306784,1478104495968880500, 23649671900884069296,378394750275931314276, 6054316003862820691584] |