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| n | a(n) |
|---|---|
| 1 | 252 |
| 2 | 4464 |
| 3 | 73152 |
| 4 | 7448760 |
| 5 | 41713056 |
| 6 | 48117888 |
| 7 | 94112928 |
| 8 | 301953024 |
| 9 | 975576960 |
| 10 | 1773584640 |
| 11 | 10759746816 |
| 12 | 46351678464 |
| 13 | 77308821504 |
| 14 | 103448378880 |
| 15 | 196718837760 |
| 16 | 233400061440 |
| 17 | 409698051840 |
| 18 | 939767546880 |
[252,4464,73152,7448760,41713056,48117888, 94112928,301953024,975576960,1773584640, 10759746816,46351678464,77308821504,103448378880, 196718837760,233400061440,409698051840, 939767546880] |