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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 576 |
| 4 | 21120 |
| 5 | 1048320 |
| 6 | 65802240 |
| 7 | 5000970240 |
| 8 | 446557224960 |
| 9 | 45830873088000 |
| 10 | 5316381278208000 |
| 11 | 687893507997696000 |
| 12 | 98231192942070988800 |
| 13 | 15345895252950201139200 |
| 14 | 2603510504983275503616000 |
| 15 | 476694375041453927694336000 |
| 16 | 93692112621783944697741312000 |
[1,2,24,576,21120,1048320,65802240,5000970240, 446557224960,45830873088000,5316381278208000, 687893507997696000,98231192942070988800, 15345895252950201139200,2603510504983275503616000, 476694375041453927694336000, 93692112621783944697741312000] |