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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 52 |
| 3 | 600 |
| 4 | 8656 |
| 5 | 149856 |
| 6 | 3026752 |
| 7 | 69866880 |
| 8 | 1814338816 |
| 9 | 52350752256 |
| 10 | 1661575754752 |
| 11 | 57531530434560 |
| 12 | 2158011794968576 |
| 13 | 87173881613869056 |
| 14 | 3772959800981143552 |
| 15 | 174183372619165040640 |
| 16 | 8543978588021450407936 |
| 17 | 443748799382401230176256 |
[1,6,52,600,8656,149856,3026752,69866880, 1814338816,52350752256,1661575754752, 57531530434560,2158011794968576,87173881613869056, 3772959800981143552,174183372619165040640, 8543978588021450407936,443748799382401230176256] |