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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 6561 |
| 4 | 6912 |
| 5 | 7776 |
| 6 | 18432 |
| 7 | 52488 |
| 8 | 393216 |
| 9 | 708588 |
| 10 | 258280326 |
| 11 | 327680000 |
| 12 | 1000000000 |
| 13 | 2097152000 |
| 14 | 1007769600000 |
| 15 | 1612431360000 |
| 16 | 1813985280000 |
| 17 | 2149908480000 |
| 18 | 3936600000000 |
| 19 | 6122200320000 |
| 20 | 6561000000000 |
| 21 | 7652750400000 |
[1,8,6561,6912,7776,18432,52488,393216,708588, 258280326,327680000,1000000000,2097152000, 1007769600000,1612431360000,1813985280000, 2149908480000,3936600000000,6122200320000, 6561000000000,7652750400000] |