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| n | a(n) |
|---|---|
| 1 | 645504 |
| 2 | 1607468544 |
| 3 | 5132640060000 |
| 4 | 15154743446853216 |
| 5 | 45929855692690790400 |
| 6 | 138493610465688295961184 |
| 7 | 418284029768568825937161600 |
| 8 | 1263090712888488868089057630816 |
| 9 | 3814456862436895259545489736740704 |
[645504,1607468544,5132640060000, 15154743446853216,45929855692690790400, 138493610465688295961184, 418284029768568825937161600, 1263090712888488868089057630816, 3814456862436895259545489736740704] |